The RHEL8 which it uses is paid as I read in few articles when centos EOL was declared. I dont know much in its practical sense, but heard its not an open source as other linux distro.
For this reason itself, centos founder introduced Rockylinux and cloudlinux team introduced Almalinux to continue centos legacy
Ok, just to clarify and avoid confusion for anyone.
CentOS Stream is both free and open source. Fedora is also free.
RHEL is a commercial product but also, since the change to CentOS Stream, has been available with a free license for dev teams and a limited number of production servers.
Having said all of that, the best migration path for production servers in my opinion from CentOS 7/8 is to AlmaLinux.