The big advantage of UNIX was that AT&T wasn't allowed to sell it, and it was basically free beer available for a symbolic price, then the UNIX V6 annotated book did the rest.
If UNIX was closed source, sold at the same price as the competition, whatever hardware it run on would have not mattered at all.
If UNIX was closed source, sold at the same price as the competition, whatever hardware it run on would have not mattered at all.