Sometimes it’s licensing cost. Linux exists because Unix was ~~a very expensive system to purchase and maintain~~ unavailable – see EDIT, so Linus Torvald tore the lid off.
EDIT: From u/Sol33t303 in the comments, apparently it was a matter of legal tie ups.
This happens with other software as well – Audacity is a free audio app that has displaced most others, *very* expensive word processing systems were kicked aside by a freeware program called PC-Write and so on. Google has continued the act (as have others) with suites of apps that displace paid ones for most everyday uses.
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