Judge Nails Google Monopoly — Now What?

Hands using smartphone with search engine on screen — Photo: BongkarnGraphic / Shutterstock

The ruling looks, at first glance, like a rare defeat for Google and a rare victory for federal antitrust enforcement — and on the merits, it is exactly that. But the remedy that followed reveals something more instructive than a simple win-loss score: a federal judge can find a company guilty of running an illegal monopoly and still conclude that dismantling it is the wrong medicine.

Key Points

Judge Leonie Brinkema of the Eastern District of Virginia found Google liable for monopolizing the publisher ad server and ad exchange markets and for illegally tying its DFP and AdX products
The Justice Department pushed for a breakup, including divestiture of Google’s ad exchange, but the court instead ordered behavioral remedies — interoperability, data-sharing, and restrictions on exclusive contracts
Google argued a forced breakup of Ad Manager was “unworkable” and would disrupt advertisers and publishers, and it had already offered interoperability concessions
This marks the third recent instance of U.S. antitrust enforcers pursuing a Big Tech breakup and failing to secure one
The gap between “guilty of monopolization” and “ordered to sell assets” is now the central fault line in modern platform antitrust enforcement

What the Court Actually Found

Strip away the headlines and the ruling is unambiguous on the question that matters most: liability. In her April 2025 opinion, Judge Brinkema held that Google unlawfully acquired and maintained monopoly power in two distinct markets — the market for publisher ad servers, the software that lets websites manage their inventory of ad space, and the market for ad exchanges, the real-time auction venues where that inventory gets sold to advertisers. She further found that Google illegally tied its exchange, AdX, to its publisher tool, DFP, forcing publishers who wanted access to Google’s advertiser demand to also adopt Google’s serving infrastructure. That is a textbook Sherman Act violation, and legal commentators were unanimous that the finding was substantive, not symbolic.

The scale of the dominance underlying that finding is worth dwelling on. Regulatory estimates elsewhere have pegged Google’s share of the publisher ad-serving market above 90 percent, a concentration level rarely seen outside utility-style industries. The UK’s Competition and Markets Authority reached similar conclusions years earlier, describing Google as holding the strongest position across nearly every layer of the digital advertising stack — ad serving, exchanges, and demand-side tools alike. That prior finding gave the DOJ’s case a running start and made the liability verdict, when it landed, feel less like a surprise than a confirmation of what regulators on two continents had already suspected.

Why the Remedy Fell Short of a Breakup

Liability and remedy are separate legal questions, and the distance between them is where this case actually turns interesting. The DOJ’s remedies filing was explicit: it wanted Google to sell off its ad exchange and potentially its publisher ad server, arguing that structural relief was “necessary to terminate Google’s monopolies, deny Google the fruits of its violations, reintroduce competition… and guard against reoccurrence”. That is the maximalist antitrust remedy — surgery rather than physical therapy — and it has a long pedigree, tracing back to the breakup logic used against Standard Oil and AT&T.

The court declined it. Instead, the final order imposed behavioral restrictions: prohibitions on certain exclusive contracts tied to Google Search, Chrome, Assistant, and Gemini, plus data-sharing and syndication obligations designed to let rivals compete for the same inventory without forcing Google to divest anything. Reuters characterized the outcome bluntly — Google “escaped” a breakup, marking the third time in recent years that U.S. antitrust enforcers sought to force a Big Tech breakup and came up short. That pattern, more than any single case detail, is the real story: American courts have repeatedly found dominant tech platforms guilty of anticompetitive conduct while remaining reluctant to order them broken apart.

Google’s Own Case for Behavioral Fixes

Google did not simply argue it was innocent; by the remedies phase, its defense had shifted to arguing that conduct rules were sufficient and breakup was reckless. The company proposed making real-time AdX bid amounts available to rival publisher ad servers, deprecating its Unified Pricing Rules, and formally committing to abandon “first look” and “last look” bidding advantages — practices it claimed had already been phased out of Google Ad Manager years earlier. In court testimony, Google’s expert called a structural breakup “a highly complicated software engineering undertaking, with… no guarantee of success,” and the company argued the DOJ’s plan would create “significant uncertainty and disruption for advertisers and publishers”.

Google made a nearly identical argument to European regulators, telling the EU its compliance plan “comprehensively addresses” concerns “without necessitating a disruptive breakup that would negatively impact the multitude of European publishers and advertisers who rely on Google’s tools”. Digiday reported the same posture domestically: Google resisted breakup and instead floated “lighter-touch remedies — tweaks to publisher contracts and interoperability with rival ad servers”. Whether those concessions restore genuine competition or simply formalize practices Google had already begun retiring on its own is precisely the question the court’s behavioral order now puts to a real-world test.

STORY 2: A judge found Google illegally monopolized ad tech but rejected a breakup, ordering behavioral fixes instead. Lola: a slap on the wrist. Wade: restraint over shattering a company. pic.twitter.com/ANneJHz1XW

— Red Desk Blue Desk (@reddeskbluedesk) September 4, 2026

The Unresolved Question: Do Conduct Rules Actually Work?

Here is where an honest accounting has to admit a gap. A monopoly finding proves market power existed and was abused; it does not, by itself, prove that non-structural remedies will fix the underlying problem. Critics on the structural-relief side, including advocacy groups like Open Markets Institute, have argued that divestiture of AdX and DFP is “technically viable and urgent” precisely because behavioral commitments in past tech cases have a mixed record of actually changing market dynamics once litigation attention fades. Supporters of the court’s approach note that behavioral remedies can be implemented “faster and with more flexibility” than a breakup that Google would likely appeal for years, delaying any relief to the market in the interim.

Both positions have merit, which is precisely why courts keep splitting the difference. A forced sale of AdX or DFP would be legally clean but operationally fraught — untangling two decades of integrated ad infrastructure carries real technical risk. Behavioral rules are faster to impose but historically easier for a well-resourced incumbent to route around. The genuine test of this ruling will not be visible in the opinion itself; it will show up over the next several years in whether independent ad exchanges and publisher tools gain real share, or whether Google’s compliance simply satisfies the letter of the order while leaving its practical dominance intact.