Comment by dralley

RHEL source code is easily available to the public - via CentOS Stream.

For any individual RHEL package, you can find the source code with barely any effort. If you have a list of the exact versions of every package used in RHEL, you could compose it without that much effort by finding those packages in Stream. It's just not served up to you on a silver platter unless you're a paying customer. You have M package versions for N packages - all open source - and you have to figure out the correct construction for yourself.