This is going to be interesting.
Discussions like this always make me happy to go back to look at the Linux Distro Family Tree
opensuse is one of the roots / oldest distros, along side debian, redhat and fedora.
Still surprised suse as a distro is around given the huge numbers of popular forks of debian and redhat.
So what will SUSE’s plan be for the SUSE fork to maintain compatibility going forward - won’t they have the same problems accessing RHEL source code as Rocky and Alma to maintain compatibility?
The source code will still be available, the GPL2 still applies. As far as I understand, RedHat will publish the upstream code that will eventually end up in RHEL. This article can explain it better than I can: https://www.theregister.com/2023/06/23/red_hat_centos_move/