In the complaint, the agency pointed out Microsoft’s record of “acquiring and using valuable gaming content to suppress competition from rival consoles, including its acquisition of ZeniMax, parent company of Bethesda Softworks,” and added that “Microsoft decided to make several of Bethesda’s titles including Starfield and Redfall Microsoft exclusives despite assurances it had given to European antitrust authorities that it had no incentive to withhold games from rival consoles.”

In a statement, Federal Trade Commission director Holly Vedova said, “Microsoft has already shown that it can and will withhold content from its gaming rivals. oday we seek to stop Microsoft from gaining control over a leading independent game studio and using it to harm competition in multiple dynamic and fast-growing gaming markets.”

The complaint continues:

Activision is one of only a very small number of top video game developers in the world that create and publish high-quality video games for multiple devices, including video game consoles, PCs, and mobile devices. It produces some of the most iconic and popular video game titles, including Call of Duty, World of Warcraft, Diablo, and Overwatch, and has a combined 154 million monthly active users around the world, according to the FTC’s complaint. Activision currently has a strategy of offering its games on many devices regardless of producer.

But that could change if the deal is allowed to proceed. With control over Activision’s blockbuster franchises, Microsoft would have both the means and motive to harm competition by manipulating Activision’s pricing, degrading Activision’s game quality or player experience on rival consoles and gaming services, changing the terms and timing of access to Activision’s content, or withholding content from competitors entirely, resulting in harm to consumers.