They really should, but is Activision-Blizzard that company? Of the 7 Activision releases in 2020 to now 4 are Call of Duty, a game that's much more popular on consoles than on PC. Blizzard is the PC side of the company, but they are mostly games that are slowly dying due to mismanagement. The IP is very valuable, but current PC sales alone wouldn't make Microsoft dominant by a long shot.