Update March 21: A day after the original post and new peak player count, Call of Duty: Modern Warfare (2019) continued to climb. It set a new peak player count of 53,410 players on Steam, at one point, having more active players than Bungie's brand-new title, Marathon. Crazy stuff. Original post follows.
Call of Duty: Modern Warfare first launched in October 2019, which was more than six years ago. It's held in high regard by a lot of the player base, and, of course, it's a game many played a lot of through the global pandemic of 2020.
