Microsoft has a lot of gaming IP that they'll only release games for on Xbox and Windows. They'll likely try using DRM and anti-cheat to avoid the likes of WINE or maybe they won't even feel the need to. It's just more effort for users anyway. And Riot Games has VALORANT. DRM heavy gaming is not going away but only just beginning.

Off topic, but Microsoft can even bypass Steam and use their own (terrible) Microsoft Store and Xbox apps on Windows as they have hard to resist exclusive content. Just like Epic Games did with their store. Platforms, not services!