Not really. While Microsoft can (and does) develop newer frameworks and features integrated into the OS that can break compatibility with existing versions of proton and wine, these changes wouldn’t affect existing games or games developed with the older frameworks.
And even if a new game is developed for these new incompatible frameworks, they will only remain incompatible until proton is patched to support them.
Meta made a twitter clone when they had the chance, they’ll happily make a YouTube clone.
I don’t think Amazon or Microsoft are very interested in entering that market, but they are the only ones with the money and compute to support such a platform.
Maybe Netflix could be interested? But I doubt it