>>8429491
Of course not.
Bill Gates sold Xenix from SCO as the first Microsoft OS
Then they bough SEADOS from Seattle Computer Products and rebranded it as MS-DOS
And then, Gates and Jobs visited Xerox PARC, took detailed notes on the STAR and Smalltalk system, then had their people implement a similar point and click OS.
Meanwhile AT&T was using Honeywell GCOS and when the saw what Honeywell's next OS (MULTICS) was like (an abortion of complexity) they rebelled and made a simpler GCOS called UNIX. That was damn good, spawned a few imitations, then clones and finally two branches, BSD and Linux. Both are still used today although Linux has better PR.
Ericsson saw UNIX and that it was good but the processes were to unwieldy and the process model incomplete. So they built the BEAM virtual machine and Erlang to write code for it. For a long time this was even more scalable that UNIX/Linux and still is going strong although now Elixir is the more popular language.
Meantime the Linux world sprouted dozens of overlapping and conflicting platforms but it does useful work for all of them.