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.