can’t speak for Proton, but it’s no wonder Windows doesn’t see Wine as a threat. because Wine sucks to run. any normal person would just run Windows instead of having to fool with Wine. it’s for us hobbyists, because we don’t mind a little pain.
Wine is an integral part of Proton, so they do see it as a threat.
Proton provides a better Windows runtime than Windows itself nowadays. Many games using legacy DirectX versions run perfectly fine on Linux, but need patches on Windows 11.
I think the better example is actually GNU, which endured several challenges as a clean room implementation of unix. I think this is legally sound, but IANAL.
not saying $TECHCO doesn’t know about X project. i’m just saying that if the average person doesn’t know about it, it’s unlikely to get shut down, as it poses no threat.