I don't think its Microsoft directly that care about gaming, There are a few factors at play. but every time a game is ported to a Playstation/Switch its being

I don't think its Microsoft directly that care about gaming, There are a few factors at play. but every time a game is ported to a Playstation/Switch its being ported to a form of Linux, and in most cases the Graphics APIs are the same. Its the companies making the game have no incentive to port to Linux if the tiny user base is fine with Proton and dealing with its hacks.