The U.S. antitrust case over Google’s ad tech stack has finally produced concrete remedies, ending 17 months of speculation about who would come out ahead. The final order stops short of a breakup: Google keeps its ad exchange AdX and its publisher ad server DfP, and the court sided with Google on most contested mechanics.
What the remedies actually change
Instead of structural separation, the order regulates how Google runs auctions inside AdX and DfP. That is meaningful, but it leaves the buy-side integration intact. Adform CTO Jochen Schlosser warned that “regulating auction access while leaving that buy-side integration intact doesn’t open the market, it just turns Google into a supervised public utility and sets up a six-year game of algorithmic hide-and-seek.”
Who gains ground
Rival exchanges such as Index Exchange, PubMatic and OpenX get real-time bid access to AdX through Prebid. Publishers will be able to run AdX demand in the same neutral auction they already use for other exchanges, rather than a separate Google-controlled integration. The likely outcome is more genuine price competition and, in theory, higher publisher revenue.
Prebid becomes the connective tissue between AdX, DfP and the rest of the market. Google will have to expose real-time bids through a Prebid API and create server-to-server connections for DfP. But the judge rejected the Department of Justice’s push for Prebid to administer auctions, calling that plan a “de facto divestiture.” Prebid becomes essential infrastructure, while Google still owns the auction logic.
Large publishers gain data rights: Google must provide historical and configuration data from DfP, plus winning and losing bid data from AdX auctions, and build an API to export that data to rival ad servers. The catch is that this applies only to open web display, not video or in-app.
Who gets less than expected
The DOJ lost most fights over timing, monitoring and DV360, even though it did secure a second major antitrust win against Google and a behavioral template for other regulators.
The bigger gap is channel coverage. CTV, in-app and retail media are not covered by the ruling, so publishers in those areas receive no direct benefit. Smaller publishers may struggle to use the new data rights without technical resources.
Scott Schiller, adjunct professor at NYU Stern, framed the tension: “The bigger question is whether a remedy focused on open-web display is solving yesterday’s market while advertising is rapidly moving toward CTV, retail media and AI.”
- Winners: Google keeps core assets; rival exchanges get Prebid access; large open-web publishers get data portability.
- Losers: CTV, in-app and retail media publishers; smaller publishers with limited technical capacity.
- Still uncertain: The Trade Desk gains some sell-side fairness but not DV360 relief; European regulators may follow or go further.
What marketers should watch
For publishers, the immediate move is to prepare for the new data access and Prebid integrations before rivals do. For advertisers and agencies, the open-web display focus means programmatic buying there may become more transparent, but the fast-growing CTV and retail media channels remain outside this remedy. Treat the next six years as an operational phase: Google’s auctions will be supervised, not structurally separated.
Source: Digiday
