And what about *BSD?
I installed 386BSD 0.1 pretty soon after it was released in mid 1992.
This replaced Interactive Systems 386/ix that I had been using on the same PC since 1987.
"If 386BSD had been available before I created Linux, then Linux might not have been born" - Linus
My impression is that there was also a bit of a culture clash. BSD was the white coat academic world and not very welcoming to outsiders. Linux was the dirty hacker style at a time where online collab became a thing.
And then there was the lawsuit that held back BSD at a crucial time in history.
1988: Sun Roadrunner (368i), SunOS 4.0 (before it got polluted with all that System V crap):
Came along later.
386BSD was 1992:
https://groups.google.com/g/comp.unix.bsd/c/TZ-gIRRHiXA/m/eA...
BSD/386, later BSD/OS, was 1993:
https://www.krsaborio.net/bsd/research/1993/0411.htm
A pic of a contemporary advert:
https://gunkies.org/wiki/BSD/386