The source can be open, just not easy to access…send an email and in 30 days they provide it, they are not obligated to have everything available instantly as they do now or provide an infrastructure to make life easy for community projects.

They could also mix in proprietary code to make things more awkward afaik.

I’d bear in mind in-house made applications RH provide include systemd, wayland, pipewire & gnome…as long as your distro and use case don’t depend on any of these, there’s no need to worry.