The advertising industry is watching two distinct Google antitrust cases converge simultaneously — and the remedies debates for each are radically different in kind, timeline, and implication for media buyers, publishers, and the programmatic ecosystem.
In August 2024, Judge Amit Mehta in Washington, D.C. ruled that Google illegally monopolized the general search market through exclusive default search deals with Apple, mobile device manufacturers, and wireless carriers. The search case is now in remedy proceedings — and the options on the table range from modest behavioral requirements to structural remedies including potential divestiture of Chrome or Google’s Android business.
Meanwhile, testimony in the DOJ adtech trial wrapped in October, and Judge Leonie Brinkema’s ruling is expected in 2025. The adtech case remedies being discussed center on the separation of Google’s publisher ad server (DFP/Google Ad Manager) from its ad exchange (AdX). These two cases involve different courts, different legal theories, and different structural changes to Google — but they interact in ways the advertising industry needs to understand.
The Search Case: What Remedies Are on the Table
Judge Mehta’s liability ruling in the search case was unambiguous: Google is a monopolist in general search, and its default search deals were an illegal mechanism for maintaining that monopoly. The remedy proceedings, which began in October and continue into 2025, are now determining what Google must actually do about it.
The DOJ’s proposed remedies in the search case are aggressive. The government has floated several options: requiring Google to divest Chrome (the browser that delivers a significant portion of Google Search’s traffic), requiring divestiture of Android or significant restrictions on how Google integrates search into Android, and requiring Google to share search index data with competitors.
The DOJ’s proposed remedy framework includes behavioral requirements as well — prohibitions on exclusive default search deals, restrictions on self-preferencing in search results — but the structural options (Chrome, Android) are what’s generating the most discussion.
For the advertising industry, a Chrome divestiture would have significant implications beyond search. Chrome is also the platform where Google has been developing Privacy Sandbox — the replacement infrastructure for third-party cookies. A divested Chrome operating outside Google’s control would fundamentally change the governance of browser privacy APIs, the implementation of advertising-relevant standards, and the relationship between Chrome’s privacy architecture and Google’s advertising products. This is the search case’s most significant advertising industry implication.
The AdTech Case: What Remedies Are Being Considered
The DOJ adtech case remedy discussion is more directly consequential for programmatic advertising. The core structural remedy the DOJ is pursuing: requiring Google to divest AdX (its ad exchange) or DFP (its publisher ad server), or both.
The theory is that Google’s vertical integration of the publisher ad server, ad exchange, and largest advertiser DSP creates an inherent conflict of interest and an anticompetitive advantage that can only be remedied structurally. Behavioral requirements — telling Google to behave differently in running its auction — have been dismissed by the DOJ as insufficient, because the company that controls all three layers of the stack has persistent incentives to tilt the playing field regardless of behavioral commitments.
If AdX were divested as a standalone exchange, the most immediate effect would be on demand supply. AdX’s premium position in the market is substantially a function of its integrated access to Google Ads and DV360 — the largest demand aggregators in programmatic. A standalone AdX would need to win that demand as a competing exchange rather than as a bundled product, which would significantly improve the competitive position of Magnite, PubMatic, Index Exchange, and other SSPs.
If DFP/Google Ad Manager were divested — which is technically more complex — publishers would have genuine freedom to choose an ad server without concern that their choice affects their access to Google’s advertiser demand. This is a structural change that would produce the most significant long-term shift in programmatic market structure.
How the Two Cases Interact
The intersection of the two cases matters for advertising-specific reasons.
If the search case results in Chrome divestiture, and the adtech case results in AdX/DFP divestiture, Google’s control over the advertising technology stack would be dramatically reduced simultaneously from multiple angles. The combination would represent the most significant structural intervention in digital advertising’s infrastructure since the industry formed.
More likely, the cases proceed on different timelines with different remedies. The search case is further along and more likely to produce a final remedy order in 2025 — though appeals are nearly certain. The adtech case’s ruling is still pending, and its remedy phase would begin after that.
What the cases share is a consistent evidentiary picture: Google has operated in digital advertising in ways that systematically benefited its own products over competitors. The difference between behavioral and structural remedies is whether you believe Google can be constrained by rules or whether the only effective constraint is breaking up the integrated stack.
Who Benefits from Each Scenario
The stakeholder analysis is worth mapping explicitly, because the two remedy scenarios produce different winners.
AdX divestiture benefits: Independent SSPs (Magnite, PubMatic, Index Exchange, Xandr) would compete for the demand supply that an independent AdX would need to attract commercially. Publishers would gain leverage in exchange negotiations. The Trade Desk and other independent DSPs would see more competitive exchange dynamics.
DFP divestiture benefits: Publishers with the capability to manage an ad server transition would gain genuine platform freedom. Alternative ad server providers (Freestar, Kevel, Prebid) would see a dramatically expanded addressable market. Publisher-SSP relationships would rebalance toward the publisher.
Chrome divestiture benefits: The entire non-Google adtech ecosystem would have a governance stake in browser privacy API development. Privacy Sandbox’s future direction would be determined by a more diverse set of interests. Independent identity infrastructure companies (LiveRamp, The Trade Desk/UID2) would operate in a more neutral browser environment.
No structural remedy: Google remains vertically integrated across all three layers. Behavioral requirements reduce some specific practices but don’t change the competitive dynamics that produce them. Independent adtech operates in the same structural environment as today.
The Timeline Reality
Appeals are essentially certain regardless of outcome. Even if both cases produce favorable liability and remedy rulings for the DOJ in 2025, Google has the resources and legal obligation to its shareholders to appeal to the Supreme Court if necessary. A realistic timeline for structural remedies taking effect puts material changes to market structure in the 2027-2030 range.
What changes immediately upon any ruling is the competitive narrative. Publishers, buyers, and independent adtech companies that have been operating under the assumption that Google’s integrated stack is a permanent feature of the landscape are already revising that assumption.
FAQ
Q: Is there any scenario where both cases result in structural breakup of Google simultaneously? Theoretically yes, but it would require both remedy judges to order divestiture and both orders to survive appeals. The more likely scenario is that one case results in more aggressive structural remedies while the other produces behavioral constraints. The search case, being further along, will likely set the tone for how aggressively courts are willing to order structural relief.
Q: How does the search case ruling affect Google’s advertising business even without divestiture? Prohibiting exclusive default search deals would reduce the traffic advantage that Google Search has over Bing and other search engines. More competitive search market share would mean less default Google search traffic to advertise against — and more search volume distributed across platforms that have their own advertising ecosystems (Bing Ads, Yahoo Search Ads).
Q: Should independent SSPs be investing aggressively in demand-side relationships in anticipation of AdX divestiture? Independent SSPs should be building direct advertiser relationships regardless of the antitrust outcome — because that’s sound competitive strategy. But yes, the adtech trial creates a specific scenario where independent SSPs that have invested in direct DSP and advertiser relationships are better positioned to absorb AdX inventory migration if divestiture occurs.
Q: What does this mean for publishers who are heavily dependent on Google Ad Manager right now? Publishers should be auditing their DFP dependency and developing at least a contingency understanding of what alternative ad server migration would involve. Not as an immediate action, but as preparedness. Understanding what percentage of fill rate and CPMs come from Google’s own advertiser demand versus independent DSPs provides clarity on the actual switching cost.