Windows Central gave a reason. MS wants devs to use their crossplay SDK, having partnered developers work and test the tools beforehand makes sense.
https://www.windowscentral.com/why-xbox-game-pass-nintendo-switch-and-other-systems-smart
Minecraft already uses that tool, it's been functioning for close to a year now. The testing it over, it works.
It would make zero sense for Ori and Cuphead to be test games for a crossplay SDK as those games don't feature any online multiplayer
From experience I can say people are nuts. I received death threats for saying that Smash Grinch rumor was fake
I never apologized for that did I? I really wanted Mach Rider playable and lashed out
Honestly, I was actually very adamant that leak was fake and was looking like a crazy conspiracy theorist trying to poke the holes in it's authenticity during that whole ordeal.