Remember back in 2019, end of august? (~11 months ago)
"Microsoft Has No Further Plans To Bring First-Party Games to Other Platforms"
"Microsoft has brought a number of their first party offerings to the Switch, with Ori and the Blind Forest just confirmed yesterday. What else can we expect Microsoft to bring over? According to a statement from Microsoft that was obtained by GamesIndustry.biz, there are no plans for more titles as of right now." -gonintendo.com
"The past year has been an exciting time for us as we have more than doubled the internal creative teams making up Xbox Game Studios. As these new studios transitioned in, we were aware of some existing commitments to other platforms and will honor them. However, going forward these new studios will focus on making games for our platforms. We have no plans to further expand our exclusive first party games to other consoles. We continue to believe deeply in cross play and progression of games with the right flexibility for developers to insure a fair and fun experience." - Xbox.
Theres also Wasteland 3 & psychonauts 2.
No clue what deal MS has for Cuphead or why it releases on PS but Wasteland and Psychonauts simply happen because MS bought them after the games had been in development already and then MS doesn't take it away from other platforms.