Google Avoids Ad Tech Breakup, but Antitrust Remedies Leave Its Market Structure Intact

Google's adtech antitrust case wrapped up with a list of behavioral changes rather than a breakup. But whether these remedies actually disrupt Google's dominance on the online advertising market remains an open question.

A federal judge has decided that Google doesn't need to break up its advertising technology empire, despite finding that the company had illegally monopolized key parts of the online ad market. Instead, Judge Leonie Brinkema issued a series of behavioral remedies designed to stop Google from giving its own services unfair advantages. The remedies apply globally for six years and target specific practices that the court found anticompetitive. Google celebrated avoiding a breakup. But a closer look at what the ruling actually requires raises serious doubts about whether anything fundamental will change.

A federal court ordered Google to change anticompetitive practices in its ad technology business but stopped short of requiring the sale of Google’s ad exchange or other major assets. The remedies ban discriminatory auction advantages, require interoperability and data access, and impose six years of monitoring, yet Google’s scale and vertically integrated ecosystem remain intact. The ruling may improve competition, but its real effect will depend on enforcement and whether Google follows the order in spirit as well as in form.

Google's dominance in advertising technology stems from a simple but powerful advantage: it controls both sides of the market. The company operates the ad server that publishers use to manage their inventory (called DFP, or DoubleClick for Publishers), the buying tools that advertisers use to purchase ads (Google Ads), and the exchange that connects buyers and sellers (AdX). This vertical integration creates a scenario where Google acts as the auctioneer, the buyer's agent, and the seller's agent all at once.

The court found this arrangement allowed Google to systematically favor its own exchange over competitors. Mechanisms like "Last Look" let AdX see what rival exchanges were bidding before placing its own bid-essentially allowing Google to peek at everyone else's cards before deciding how to play its hand. "First Look" gave AdX the first chance to bid on ad impressions before other exchanges could compete. Google also tied its ad server to its exchange, making it difficult for publishers to use competing services without losing access to advertiser demand.

The remedies aim to address these specific practices. But here's the thing: Google still owns all the pieces. The company isn't being forced to sell AdX or DFP or any other part of its ad stack. Instead, Google must operate those businesses under new restrictions intended to prevent the practices the court found anticompetitive.

The ruling prohibits Google from enforcing contract terms that tie DFP to AdX. Publishers using Google's ad server should now be able to work with competing exchanges without penalty. Google also can't bring back auction mechanisms that give AdX preferential treatment, like the infamous Last Look and First Look advantages.

Both AdX and DFP must now integrate with Prebid, the open-source technology that enables header bidding. This technique lets publishers invite multiple ad exchanges to compete for their inventory simultaneously, rather than routing everything through Google's systems first. Google resisted supporting Prebid for years, and the court decided that resistance needs to end.

The ruling also requires AdX to make real-time bids available to rival publisher ad servers. Until now, publishers who wanted access to advertiser demand flowing through AdX generally needed to use Google's ad server. The idea is that publishers should be able to evaluate DFP based purely on its merits as an ad server, not because it's the only practical way to access Google's massive exchange.

Google must provide publishers with their historical data and configuration settings from DFP, plus ongoing bid data from AdX. This data portability requirement aims to reduce switching costs. Publishers who want to try a competing ad server won't have to start from scratch or lose access to the information they need to make informed decisions.

The remedies also prohibit both AdX and DFP from discriminating based on whether publishers or advertisers use Google's technology. AdX can't penalize publishers for using rival adtech, and DFP can't favor bids simply because they came through Google's systems. Google Ads can't recreate the closed bidding pipeline that gave Google-to-Google transactions an advantage.

Finally, a court-appointed monitor will oversee compliance. This monitor, paid for by Google, can inspect source code, review algorithms, examine documents, and interview employees. A technical committee and internal compliance officer add additional layers of oversight.

These changes sound significant on paper. But implementation details matter enormously in tech markets, and formal compliance does not mean the remedies will actually work in practice. Small differences in how the requirements and implemented could easily affect how publishers and competing adtech platforms can exploit them.

Take the Prebid integration requirement. Rajeev Goel, CEO of adtech company PubMatic, testified for the Department of Justice during the trial. He pointed out that if Google's integration works differently from how Prebid connects with other exchanges, it could create friction that makes competing exchanges less attractive. The court specified that integrations must be "functionally equivalent," but determining what counts as functionally equivalent will inevitably lead to disputes. Even relatively small differences in implementation could satisfy the formal requirement while still creating practical disadvantages for competing exchanges.

The same issue applies to data portability. Sure, publishers can get their data. But will it be formatted in a way that's easily usable with competing ad servers? Will it include everything publishers need to make a clean transition, or will there be gaps that force them to rebuild systems from scratch? These technical details will determine whether the remedy actually reduces switching costs or just creates the appearance of compliance.

The prohibition on discrimination raises similar questions. Google can still prioritize its own exchange when doing so would produce better results for advertisers-if, for example, AdX offers superior fraud detection or privacy protections. But who decides what constitutes a legitimate quality difference versus disguised self-preferencing? Google has spent years building features and integrations across its ad stack. Determining which advantages stem from genuine innovation versus anticompetitive tying won't be straightforward.

The court-appointed monitor adds oversight, but monitors have limitations. They're expensive, they depend on cooperation from the company they're watching, and they can't be everywhere at once. Google's ad systems involve millions of lines of code and process billions of transactions. A monitor might catch blatant violations, but subtle forms of self-preferencing could easily slip through.

Wyatt Fore, a partner at law firm Shinder Cantor Lerner, noted that independent monitors can be useful in complex technology cases, particularly when companies might technically comply without fulfilling broader intent. But he also acknowledged there will be "a million disputes" about whether Google is actually complying. Each dispute will require investigation, analysis, and potentially litigation. Google has the resources to fight each battle, while competitors and publishers may struggle to document violations and push enforcement.

The six-year term for these remedies creates another problem. Six years is a long time in technology markets, but it's not permanent. If switching costs, entrenched integrations, and Google's existing scale remain largely intact, the restrictions could expire before they produce lasting changes in market structure. The company has also announced plans to appeal part of the liability ruling, which could further delay implementation.

The fundamental issue is that these behavioral remedies don't alter market structure. Google still owns the dominant ad server, the dominant exchange, and the dominant buying platform. Network effects and economies of scale continue to work in Google's favor. Publishers and advertisers have spent years building workflows around Google's tools. Switching costs exist beyond just data portability-they include training, integration with other systems, and established relationships.

Patrick Briggs, CEO of digital ad agency HubShout, suggested that removing advantages like Last Look could improve trust and value in the broader display ad market. That's possible. But improving trust doesn't necessarily shift market share. Google's tools might still be the path of least resistance for most market participants, particularly smaller publishers and advertisers who lack the resources to manage multiple platforms.

Nick Stoltz, chief strategy officer at media-measurement company Measured, argued that the remedies should "create a fairer market and put other sell-side platforms on a more even playing field." Again, possibly. But creating a theoretically level playing field doesn't guarantee that competitors can actually compete effectively against an entrenched incumbent with massive scale advantages.

The News/Media Alliance, which represents publishers, released a statement calling the remedies "a positive step" but insufficient to trigger true market competition. The organization argued for stronger guarantees around the value of ad space to ensure fair compensation for publishers. That critique gets at a key limitation: these remedies tinker with auction mechanics but don't fundamentally change the power dynamics between Google and publishers.

The remedies are designed to change how Google’s ad tech interacts with publishers, exchanges, and competing buying tools.

The remedies haven't taken effect yet. The court still needs to issue a final order spelling out implementation details. Google plans to appeal, which will delay enforcement further. Even once the remedies are in place, it'll take time to see whether they actually change market dynamics.

Rival exchanges and ad servers will test Google's integrations and look for ways the company might be undermining competitors. Publishers will weigh whether switching away from Google's tools makes economic sense. Advertisers will watch to see if auction dynamics actually improve. The monitor will investigate complaints and review compliance.

All of this creates uncertainty without guaranteeing meaningful change. Google retains the structural advantages that made it dominant in the first place. The company has deep pockets, talented engineers, and years of experience navigating regulatory requirements. Competitors face the challenge of trying to chip away at an entrenched incumbent while that incumbent still controls the core infrastructure.

Six years from now, will the online advertising market look substantially different? Or will Google still dominate ad serving, exchanges, and buying tools, despite operating under tighter restrictions? The remedies may constrain some of the conduct that helped reinforce Google's position, but they do not change who owns the core infrastructure or guarantee meaningful shifts in market share. Whether they ultimately produce a more competitive market will depend on how effectively those restrictions work in practice.

The ruling gives publishers and competing adtech companies more room to challenge some of the practices that helped reinforce Google's position. It restricts self-preferencing, opens parts of the stack to competitors, and gives the court meaningful oversight tools. Those changes could make parts of the market fairer.

What they do not do is change who owns the infrastructure.

Google still controls major parts of the ad serving, exchange, and buying process, along with the scale, integrations, and advertiser demand that make those products difficult to replace. The remedies are designed to constrain how Google uses that position, not dismantle it.

That leaves the central question unresolved. If the goal is to stop specific anticompetitive practices, these remedies may prove meaningful. If the goal is to create a substantially more competitive adtech market, the test will be whether those behavioral restrictions are strong enough to overcome the structural advantages Google still retains.

For now, the ruling changes the rules around Google's dominance without changing the structure that created it.