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If they're going this way, why not just replace the macOS kernel (XNU) with Linux? They'll get so much more.

Because the rest of the system uses a bunch of things that have no drop-in Linux equivalent - SIP, Mach ports, firmlinks, etc.

Those can be emulated with the likes of SELinux, sockets, and bind mounts. It will take a lot of effort and some adaptation, but it could be done.