US District Judge Leonie Brinkema issued her remedies ruling in United States v. Google on Tuesday, confirming the underlying monopoly finding against Google's AdX exchange and DFP ad server, and rejecting the Department of Justice's proposal to require Google to divest either. The liability finding — that Google operates an illegal monopoly in the open web display advertising stack — dates to April 2024. The remedies ruling, which defines what happens next, chose behavioral modifications over structural separation.
The mandated changes are specific and, in parts, materially significant. Google must share real-time bid amounts for open web display ads with rival ad servers — a transparency requirement that directly addresses one of the structural complaints that has circulated in the publisher community for over a decade. Unified Pricing Rules, which constrained publishers' ability to set differential price floors for different buyers, must be deprecated. Publishers must be permitted to set different price floors for individual bidders. The "first look" and "last look" bid-adjustment privileges that Google's own buy-side systems had within the auction must end.
These are genuine changes to how the programmatic auction operates. Real-time bid transparency enables competing ad servers to compete on actual information rather than working around information asymmetry that benefited Google's stack. The end of Unified Pricing Rules restores pricing flexibility that publishers — particularly large premium publishers — have sought for years. The removal of first-look and last-look privileges levels the competitive dynamic at the moment of auction that has always been the core complaint.
What the ruling does not do is change the ownership structure. Google continues to own and operate AdX, the dominant exchange for premium web inventory, and DFP, the dominant publisher ad server. The fundamental dynamic that generated the monopoly finding — that Google operates on both the buy side and the sell side of the auction it also runs, with a separate buy-side optimisation layer that routes Google advertisers through that auction — remains intact. Behavioral remedies address the symptoms of that structure. They do not address the structure.
The advertising industry's response divided along predictable lines. PubMatic said the remedies "should establish a level playing field" — cautious optimism from the sell-side platform perspective. Jay Friedman, co-founder of CartographAI and a long-time programmatic market observer, was more direct: behavioral fixes do not address the core publisher problem of accessing Google's buy-side demand while using a competing ad server. That problem, the argument goes, is architectural: it requires structural separation to resolve, not conduct rules that Google's own teams implement and self-certify.
The ruling has a downstream implication for publishers and advertisers that is worth stating directly. The programmatic ecosystem for the next several years operates inside a framework that Google designed, built, and continues to operate. Behavioral remedies change some of the rules within that framework. They do not change who built the framework, who maintains it, or who benefits most from its persistence. For the independent ad tech ecosystem — the SSPs, DSPs, data companies, and measurement providers that operate around Google's stack — this ruling provides incremental improvements in operating conditions. It does not provide the structural level field that a forced divestiture of AdX might have created. That question — whether structural remedies are the appropriate response to ad tech monopoly — remains open, and the US ruling does not close it. European regulators, operating under a different legal framework with different remedies powers, are watching.