A sign outside the main entrance of the Meta Platforms Inc. office building in the 'Silicon Docks' area of central Dublin, Ireland. Photo by BLOOMBERG FILES

Meta Platforms Inc. scored a major victory in federal antitrust court on Tuesday when a judge concluded that the company doesn’t need to unravel its acquisitions of Instagram and WhatsApp, because it’s not a monopoly. But the judge’s reasoning may sting.

Judge James Boasberg on Tuesday sided with Meta, saying it can remain intact because its market share is already declining. Even if Meta is growing, so is the universe of options for spending time online, and Meta is looking more and more like its competitors, he wrote. The field is only going to get more crowded in the artificial intelligence age, the judge added.

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