Unless you happen to use Rocky Linux, AlmaLinux, or Oracle Linux. It doesn't affect Debian, or Ubuntu, or openSUSE, or Arch, or anybody else.
So, stupid question, but would Fedora be affected at all? I know that's related to Red Hat, but I'm guessing it's not affected since it's not based on RHEL.
It's not a question of legality really, but more one of an ethical nature. It sort of depends on you, as to whether or not you're bothered by RedHat doing this or not.
I'd say I'm bothered by it, but there's not really anything I can do about it. I'm disappointed the GPL doesn't have stricter rules regarding the distribution of source code though. I feel like it kinda defeats the purpose if sources aren't freely available to anyone who wants to use them.