I know what you’re trying to say. That Proton IS Windows at some level. And so MS gets some credit for that. But they don’t.
A lot of actual work went into Proton and into making games work therein.
MS is a slow, lumbering, monoculture that has lacked innovation and creativity for a very long time. I don’t see how freezing APIs or keeping old APIs around (mostly through versioned DLL hell) as some grand accomplishment.