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The final US remedies against Google's ad tech business are set – and the publisher industry is starting to assess their practical impact. The central hope: AdX must open up more to Prebid and competing ad servers. The central concern: Google's demand remains so dominant that technical interoperability alone will not automatically reshape the market.
The US Department of Justice published the key measures on 16 September 2026. A recent Digiday survey of seven executives from publisher revenue teams and sell-side ad tech now shows where the industry sees real opportunities and where it expects major implementation gaps.
AdX access is publishers' most important lever
According to US Department of Justice, Google must build integrations through which Prebid and competing publisher ad servers can access AdX bids in real time.
This is precisely the point rated most positively in the current Digiday analysis. The operational advantage is obvious: a publisher could in future use a competing ad server without automatically losing access to Google's large AdX demand.
This addresses a central lock-in effect. Until now, switching away from Google Ad Manager has been economically risky for many publishers because AdX demand was not available on equal terms.
The decisive question is Google's demand
The catch: even if AdX becomes technically more open, Google AdWords remains one of the most important demand sources within AdX. Several industry representatives surveyed by Digiday therefore ask whether this demand will actually appear in auctions run through competing ad servers with the same quality and breadth.
This is where it will be decided whether interoperability merely exists technically or also works economically. An alternative ad server helps publishers little if the most valuable demand remains better reachable within the Google stack.
The problem is compounded by the fact that the market for large alternative publisher ad servers has shrunk over the years. The remedies therefore create access, but not automatically new strong competitors.
Data export is meant to lower switching barriers
Google must also make it easier for publishers to retrieve and export their own data from DFP and AdX. This is intended to reduce switching costs and facilitate independent comparisons.
For publishers this is especially relevant, because an open technical interface achieves little if historical inventory, demand and revenue data remain practically trapped in the old system. More data portability can make tests with other providers more realistic.
This fits the broader trend toward more first-party data and independent measurement.
Some rules address practices Google says it has already changed
Not every remedy is likely to have large effects in the short term. Google may no longer grant its own exchange privileged first-look or last-look advantages. Digiday points out, however, that Google states it has not used these practices since 2019.
This is also why publishers do not expect any sudden change in their revenues. Some rules are important safeguards against old behaviour without necessarily generating new revenue.
The same applies to pricing rules: publishers are to regain more freedom to set different price floors for different buyers and exchanges. This increases control, but does not automatically make yield management more successful.
Six years of oversight – but implementation takes time
Google will be overseen for six years by an independent monitor and a technical committee. At the same time, long implementation deadlines apply to the most important technical openings.
Already in the first analysis of the ruling it was clear that parts of the Prebid and ad server integration may require twelve to 15 months. The question of the actual impact can therefore likely only be answered reliably 2027.
For publishers, enforcement is therefore at least as important as the wording. What will matter is whether technical specifications, latency, data access or other details practically disadvantage competing systems.
No breakup, but a test of interoperability
Google does not have to sell AdX. Instead, the court relies on behavioural remedies and technical opening. This shifts the competition question: can a market that remains vertically integrated actually become more competitive through binding interoperability?
The remedies mainly concern open-web display. At the same time, budgets are shifting toward retail media, CTV, apps and more automated AI advertising systems. This further limits the reach of the ruling.
Google itself is in parallel expanding products such as AI Max and agentic commerce. For marketers, the question of how much targeting, creative selection, delivery and measurement takes place within a single platform ecosystem therefore also becomes more important. Our article on AI agents in media buying and cost audits shows why automation increases the need for independent control rather than reducing it.
Other platforms are also under regulatory scrutiny over ad auctions. The FTC, for example, accuses Amazon of manipulating ad auctions.
What publishers should watch now
In the short term, Google Ad Manager remains the dominant stack for many publishers. Four practical signals will be interesting:
- Does AdX demand actually reach competing ad servers in a comparable way?
- Are data exports complete enough to test alternatives cleanly?
- Do new or stronger ad server offerings emerge once AdX lock-in declines?
- Does oversight react quickly if technical details weaken the effect of the rules?
The remedies are therefore not an immediate restart of the ad tech market. However, for the first time they create concrete technical conditions under which publishers could leave or supplement the Google stack without automatically giving up a central demand pool.