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@thomasfuchs @brouhaha Modern BSDs depending on how you draw the line starting with Net/2 or with 4.4BSD-Lite Release 2 are legally and logically separate from their original Unix history and should be considered reimplementations.
Also, those are just drivers and subsystems that are borrowed from and not the Kernel. XNU/Mach never were part of the main Unix family.
And using drivers and the network stack from BSD is in no way unique to MacOS, QNX and Windows NT did the same.