Does Microsoft have the power to pull the plug on Linux gaming?

So I'm talking about playing previously Windows-only games on Linux, e.g. via proton.

I don't know about the libraries etc that are used - is it possible for Microsoft to use some legal voodoo, for example, to suddenly end it all, and make the use of their libraries illegal (if they belong to Microsoft in the first place)?

Or could there be other ways of interference?