Google loses ad tech monopoly case

Google has illegally built "monopoly power" with its web advertising business, a federal judge in Virginia has ruled, siding with the Justice Department in a landmark case against the tech giant that could reshape the basic economics of running a modern website.

The ruling that Google violated antitrust law marks the US government's second major court victory over Google in less than a year amid claims the company has illegally monopolized key parts of the internet ecosystem, including online search. And it is the third such decision since a federal jury in December 2023 found that Google's proprietary app store is also an illegal monopoly.

Taken together, the trio of decisions highlights the breadth of trouble Google faces, raising the prospect of sweeping penalties that could reshape multiple aspects of its business, though ongoing and expected appeals will likely take years to play out.

Thursday's decision by District Judge Leonie Brinkema, of the US District Court for the Eastern District of Virginia, addresses the $31 billion portion of Google's ad business that matches website publishers with advertisers. This "stack" of technologies determines what banner ads appear on countless sites across the web.

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