NeXTSTEP wasn't based off the Linux kernel, and I think even if it had been GPL'd, it probably wouldn't have ended up that the Linux port was the preferred way to run it. Consider that OPENSTEP/Mach was contemporaneous with Red Hat Linux 4 and kernel 2.0. Everybody in the market for a desktop Linux distribution at the time would have jumped ship. If anything, the Mach 2.5 microkernel would have been stripped out in favor of a pure FreeBSD system, which would probably have resulted in Linux having the same also-ran status that the BSDs have now.
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NeXTSTEP wasn't based off the Linux kernel, and I think even if it had been GPL'd, it probably wouldn't have ended up that the Linux port was the preferred way to run it. Consider that OPENSTEP/Mach was contemporaneous with Red Hat Linux 4 and kernel 2.0. Everybody in the market for a desktop Linux distribution at the time would have jumped ship. If anything, the Mach 2.5 microkernel would have been stripped out in favor of a pure FreeBSD system, which would probably have resulted in Linux having the same also-ran status that the BSDs have now.