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Losing an antitrust case and facing meaningful consequences are, it turns out, two very different things. A US federal judge has ruled that Google will not be required to sell its online advertising exchange, formerly known as AdX, despite the company having already lost the underlying antitrust trial in 2025. The Department of Justice had pushed hard for the divestiture as the centrepiece of its proposed remedy. It did not get it.
The outcome is a significant moment in the broader story of how governments are attempting to rein in Big Tech. And the lesson it sends is uncomfortable for regulators everywhere: winning in court does not guarantee structural change.
What Google Actually Lost, and What It Kept
The ad tech antitrust case centred on Google’s dominance across the online display advertising ecosystem. Government lawyers argued that Google had effectively rigged the system in its own favour, leveraging its control over tools used by both publishers and advertisers to crowd out competitors and lock participants into its own infrastructure.
The court agreed with part of that argument. Specifically, the judge found that Google had illegally locked publishers into using its ad exchange, which acts as the marketplace connecting ad buyers and sellers. That finding was a genuine legal defeat for the company.
But the court did not find that Google had broken the law with respect to the tools used by advertisers. That distinction mattered enormously when it came time to decide what should actually be done about it. The DOJ and a coalition of state attorneys general argued that forcing a sale of the ad exchange was the cleanest and most effective remedy, a structural fix that would create genuine competition rather than relying on behavioural conditions that Google could work around over time. The judge disagreed, and the exchange stays within Google’s portfolio.
Small Revenue, Large Symbolism
It is worth being precise about what AdX represents financially. The ad exchange is a relatively modest contributor to Google’s overall revenue, which in 2024 exceeded 300 billion US dollars. A forced sale would not have gutted the company. What it would have done is send a signal, and that signal is precisely why the remedy attracted so much attention.
Big Tech firms have faced a sustained wave of antitrust scrutiny over the past several years, across the United States, the European Union, and beyond. That wave has produced court victories for governments and regulators, but structural remedies, meaning orders to break up, divest, or fundamentally restructure a dominant business, have remained elusive. Google’s search antitrust case, also in the US, is still working through its remedy phase. Meta has faced antitrust action over its acquisitions of Instagram and WhatsApp. Apple has battled regulators over its App Store. In most of these cases, the companies have absorbed the legal findings and continued operating with their core businesses intact.
A forced divestiture of AdX would have been the exception. It would have demonstrated that antitrust law in the United States still had teeth capable of biting into a company’s actual structure, not just its conduct. That demonstration will not happen here.
What This Means Beyond the Courtroom
For businesses and regulators in Southeast Asia watching this case, the implications are worth thinking through carefully. Malaysia’s Communications and Digital Ministry has been developing its own frameworks around platform accountability and digital market fairness. Singapore’s Competition and Consumer Commission has similarly been active in examining digital markets. Neither regulator has the jurisdictional reach to act against Google’s ad infrastructure directly, but both operate in environments where Google’s ad exchange is the dominant mechanism through which digital advertising inventory is bought and sold.
When publishers in Malaysia or Singapore sell ad space programmatically, they are almost certainly routing transactions through the same exchange the DOJ just failed to break apart. The competitive dynamics that the US court found to be partially illegal are the same dynamics that shape the economics of digital publishing across the region. A divestiture would have introduced a new independent operator into that market, with unpredictable but potentially significant effects on pricing and competition. That scenario is now off the table.
More broadly, the ruling reinforces a pattern that regulators globally are grappling with: antitrust law, as currently applied, is better at identifying harm than remedying it. Courts can find that a company behaved illegally. They are far more reluctant to order the kind of structural surgery that would actually change the market. Behavioural remedies, meaning rules about how a company must conduct itself going forward, are the more likely outcome, and they are historically difficult to enforce against a company with the resources and legal sophistication of Google.
The Antitrust Era Is Not Over, But Its Limits Are Clearer
None of this means antitrust enforcement against Big Tech is futile. The legal findings against Google in this case are real, and the company will face some form of remedy even if divestiture is off the table. The search antitrust case could yet produce more consequential outcomes. The EU’s Digital Markets Act is pursuing a different approach entirely, using ex-ante regulation rather than case-by-case litigation, and has already produced more immediate compliance requirements.
But the ad exchange ruling is a data point that matters. It shows that even when a government agency builds a credible case, wins on key findings, and proposes a specific structural fix, the judiciary may still decline to impose it. For anyone hoping that the current wave of antitrust action would fundamentally reshape the power of the largest technology platforms, this is a reminder that the path from courtroom victory to market transformation is far longer and more uncertain than the headlines suggest.
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