No commercial UNIX was ever on open source camp, in fact they are the very reason while GCC was ignored for several years, it got a bunch of helping hands as Sun started the trend of user and development UNIX versions.
Also given NeXTSTEP heritage, UNIX on NeXTSTEP was always a means to have a foot on the DoD UNIX requirements, there was nothing open source about Renderman, Lotus Improv and many other NeXTSTEP based tooling.
That was wishful thinking from the get go.
No commercial UNIX was ever on open source camp, in fact they are the very reason while GCC was ignored for several years, it got a bunch of helping hands as Sun started the trend of user and development UNIX versions.
Also given NeXTSTEP heritage, UNIX on NeXTSTEP was always a means to have a foot on the DoD UNIX requirements, there was nothing open source about Renderman, Lotus Improv and many other NeXTSTEP based tooling.