RedHat is owned by IBM since July 2019. They commited 2nd most changes to the Linux kernel, after Intel. Who "owns" Linux? Here's the
list of members of the Linux Foundation. Compare to that to the FreeBSD Foundation...
Well, from a technical viewpoint FreeBSD is better in many aspects, equal in some, and worse in a few. Most Open Source software is developed on Linux, just because that's what the developers (nerds) have on their machines. That's a criterium (availability of software (-stacks)). Thus, yes, I do think in the end it's this profane reason. In general, people do not like to try & learn something new, when they know what they're used to & know about is sufficient for the task. If it would be only for technical reasons, I guess DragonFly BSD should have a 67% market share on super-clusters.