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(Repurposed HN comment.)
The BSD/Linux thing was there right from the start, but it was more complicated than a simple us-vs-them. The thing is that there were a whole bunch of competing commercial Unix-like OSes in the 1980s.
But there were other prejudices as well.
In Proper Grown-Up Unix terms, PCs were toys, poorly-made weird little things that were no more than office equipment. So nothing worth using ran on the 386.
There was no local bus yet, no IDE or EIDE, slow AT expansion bus, no processor cache, and so on -- meaning a forest of proprietary or semi-proprietary extensions and buses and special slots. This opened up a market for a vendor to port to Brand X PCs and Brand X's own weird storage and display.
Enter Interactive Corp, which tried to combat this, and worked on Unix ports for various vendors' hardware. Expensive OS for expensive machines.
And there was SCO which wasn't proud, wasn't fancy, ran on commodity kit, and didn't try to be a general purpose OS like that white lab-coat brigade expected. So SCO Xenix worked, and you could run apps on it, but in the box there was no C compiler, no networking, no X11, nothing. It was a runtime-only OS and it was still expensive.
Everyone sneered at it but it did the job. I put in a lot of it.
Then if you weren't paying, someone else was who would never see the word "Unix", there were all the vastly expensive RISC boxes with their vastly expensive expansions and vastly expensive -- well, everything. Sun, HP, DEC, IBM, SGI, loads of company would sell you rooms full of workstations, single-user minicomputers with big screens. They cost as much as a house.
Actual BSD ran on actual minicomputers that cost as much as a small street of houses and those dudes wouldn't even look at PCs.
Which left a market for enterprising vendors squeezing Unix-like things onto low end kit.
Various flavours of BSD, including BSD/OS; SCO Xenix in both 286 and 386 versions; Interactive 386ix; several vendors' own-brand licensed Unixes, including Dell, later, an official Intel one that mainly ran on Intel's own pizza-box workstations.
And all the proprietary computer vendors entered the game too. Commodore did Unix for high-end Amigas; Atari did Unix for high-end STs; Acorn did Unix for high-end Archimedes; Apple did Unix for high-end Macs, allegedly originally just to get a US military deal; etc. etc.
All these are still $1000 per instance OSes though.
Then, universally scorned, MWC Coherent, a real Unix-like OS for $99... and QNX, which was apparently good but mainly focused on real-time stuff, and cost more than the casual could afford.
(As a European I never saw this but it was in all the ads in all the US mags. There was a lot of "cheap" American stuff we didn't get over here, like paid-for shareware. We had metered phone calls so no BBS scene. Only rich Americans got that stuff.)
Coherent was so good that AT&T accused them of theft and sent Dennis Ritchie around to check. He came back and said, no, it's legit.
And Andy Tanenbaum's Minix, a toy for students, not for real work, but essentially free with a book.
These latter indirectly showed that you _could_ copy AT&T's holy grail and make it work, so while Richard Stallman was building all the tools but choosing the wrong kernel and sabotaging the whole thing, along came this Finnish kid with his learning exercise, and excited beardies on Usenet said that it actually worked and it was at least as good as Minix and was getting to Coherent levels.
So the point is, there was a spectrum, from legendary machines made from purest unobtainium, to ludicrously expensive x86 stuff for very specific (and ludicrously expensive models) of PC kit, to the still ludicrously expensive SCO that got no respect, to "cheap" stuff that nobody had in Europe because it had no business purpose. There was legendary free stuff in America but it only ran on room sized computers that cost as much as a lottery win, so I never saw it. "Free" as in "it's free if you're so rich it doesn't matter."
And "free" shareware that was "free" as in "the phone bill to get it will cost more than just buying a commercial version in a shiny box".
But there _was_ a spectrum, from vastly expensive to "a small business will pay for this", down to theoretical stuff in America that you could dream about... which paved the way until the point where an ordinary PC was a 32-bit machine with a memory management unit and hundreds of megs of disk and several megs of RAM, and suddenly, this Lin-Min-Gnu-ix thing was doable, if you had a beard and a checked shirt with black jeans and wore hiking boots every day.
