Activision Blizzard stopped releasing new Call of Duty games on Steam in 2018, opting to make Call of Duty: Black Ops 4 exclusive to Blizzard's Battle.net platform on PC. That store exclusivity strategy ended just last year with Modern Warfare 2, and according to Microsoft's lawyers, the whole thing was a "resounding failure." That might be a slight exaggeration, though.
In a court document filed today (related to the recent hearing over Microsoft's pending acquisition of Activision Blizzard), Microsoft's legal team affirms the notion that Call of Duty's Battle.net exclusivity ended because it wasn't performing like Activision Blizzard had hoped—but what success would've meant is stated in terms of Battle.net's success, not CoD's, which leads me to quibble with it a bit.
