Alma and Rocky have been around for a while already. Most people I know moved over to those after Centos went EOL. Not sure what Suse will do that these don’t already do.
From the announcement: the will cooperate with Rocky and others to have a common rhel compatible fork
Alma and Rocky depend on the publicly available source code for RHEL. Red Hat decided to close source except to paying customers. https://www.theregister.com/2023/06/23/red_hat_centos_move/