centos used to be 1:1 clone of rhel sans branding, ibm replaced it with rolling release 'centos stream' upstream of rhel

now we have 'rocky linux' taking the place of old downstream centos as 1:1 bug-for-bug rhel compatible (against ibm's wishes)

and 'almalinux' building a stable release on top of centos stream (ibm seems to be ok with)