That is not a thing. No part of rhel is closed up: subscribers can still download the source rpms, and the sources themselves are still the same as upstream. Every change they make to the sources is still pushed upstream for everybody to use.
What is broken is automated rebuilds, and if people have a principle problem because they think libre stuff should necessarily be gratis I think they have the wrong principles.
Regardless of that, the rage bait narrative that red hat is “closing down sources” is that, rage bait.