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It's safe, worked from previously apple owned darwin oss, opendarwin and mklinux, also apple provided mostly of base OS under OSS license/APSL.
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Wine and Proton are more popular than all of these examples combined and even have corporate sponsors, yet Microsoft hasn’t tried to stop them.
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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.
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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.

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I think the core of this is google vs oracle case. I think they'll be in the clear unless they hit some specific (design?) patents.
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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.
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Microsoft definitely know about ReactOS.
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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.
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