I think what OP is talking about is change in the (for rebuilders) source distribution availability, e.g., https://www.redhat.com/en/blog/furthering-evolution-centos-s... -- but as a later blog post points out (https://www.redhat.com/en/blog/red-hats-commitment-open-sour...), the source is still available in a different location, though perhaps at a slightly different point in the release cycle: forward looking to RHEL next.

My response is in that context, that even if one were to consider the removal of those source locations somehow a "license change" (and I agree with you, it is not), nearly everyone working on RHEL would still be an OSI developer, for reasons pointed out by Mike.

Which is a very good thing, and as a former Red Hatter, thank you for helping to keep that possible Richard!