It's much easier to upstream your desired changes than maintain a separate fork (closed or otherwise) long-term. Additionally, many of the contributors have been using it for own servers, not required to contribute back.
Things like NVidia and other closed drivers show you can bolt a non-open part to the GPL code if you try enough.
> And without copyleft, Linux would have been a hobby OS that died out in the early 90s. We'd be using things like Windows Server, Unix, etc.
This ignores the entire existence of FreeBSD, NetBSD, OpenBSD.
> they'd have heavy DRM schemes, obfuscation, cryptographic licensing
This ignores the existence of heavy DRM schemes, obfuscation, kernel-level anticheat spyware, criminalisation of copyright-circumvention schemes, etc.
At this point, I think you're just trolling, so I'll stop here.
