Dont think it has anything to do with sales, seems like concessions being made to get the merger approved, like Blizzard games becoming part of the Ubisoft+ subscription.
https://news.ubisoft.com/en-us/arti...H/activision-blizzard-games-coming-to-ubisoft
https://news.ubisoft.com/en-us/arti...H/activision-blizzard-games-coming-to-ubisoft