This move follows the FTC’s legal challenge against Microsoft’s $75 billion acquisition of Activision Blizzard, which faced antitrust concerns around Microsoft’s cloud gaming business. While a federal court allowed the acquisition to proceed, the FTC’s appeal highlights its commitment to maintaining oversight of Big Tech’s market reach.

The probe would be the latest regulatory scrutiny against Big Tech from FTC Chair Lina Khan. Microsoft already faced a challenge from the FTC under Khan’s leadership targeting its acquisition of video game publisher Activision Blizzard, a $69 billion deal that was one of the largest in tech history.