A federal judge ruled Google has run illegal monopolies on two markets for web advertising technology. It’s the second antitrust ruling against Google in the past year. In 2023, a federal jury also concluded Google’s proprietary app store is an unlawful monopoly. But the judge on Thursday struck down one of the Justice Department’s arguments against Google, making it unclear whether or when Google will be forced to sell off part of its online ad business. Consumer advocates welcomed yesterday’s news, with Massachusetts Senator Elizabeth Warren declaring, “Google is an illegal monopolist — and it’s time to break up this tech giant.”