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Didn’t Microsoft somehow ruin Dr DOS? Not technically, but didn’t they sue them or something? Which would mean this is the same issue, 40 years later. Yes, I was there on the 80s, but I had a Commodore 64. We did use GEOS, if that counts. I was not present for the 70s.
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> at major universities and research centres

So not common outside of ivory towers, no?

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I went to a regional state university. We had an older IBM mainframe with a hypervisor and the students and faculty were all users on MUSIC/OS. This was in the early/mid 1990s.
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Before IBM PC computer's weren't particularly commonplace outside of ivory towers either.
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