For those who run Fedora as a server (versus CentOS/Alma/Rocky), why?

Rocky Linux is maintained by a for-profit business, the Rocky Enterprise Software Foundation (RESF) which is owned by a single person, and also owns all trademarks for Rocky Linux. This could be an ethical or philosophical issue depending on your views. Contributions to Rocky Linux require signing a contributor license agreement giving RESF (and its single owner) full rights over those contributions in perpetuity.

The single owner of RESF is Gregory Kurtzer, who is also the CEO of Ctrl IQ, Inc. which is an enterprise software support company that provides major funding for Rocky Linux and uses it a base for many of their products and services. Ctrl IQ, Inc. technically only provides legal support and funding and claims has no direct control over Rocky Linux. However, with Kurtzer being both the CEO of Ctrl IQ and the sole proprietor of RESF, some people question the claim in practice.

Essentially, in my own words as I understand it, it's bad because its foundation is the same, in spirit, as RHEL itself.

Personally, and this just my naive opinion, I think if Gregory Kurtzer had been the one in the hot seat at Red Hat, he would have done the same exact thing they did when ending CentOS and amending their EULA/TOS. I'm not making a value judgment there, I just think his motivation is profit and not the ideals of open source software.