I think both ways of looking at it are worthwhile, and both are covered by what FedeProxy might provide. On the one hand you have the big commercial players that want to offer a comprehensive and complete ‘developer experience’, like Github and Gitlab. On the other end of the spectrum you’ll find opinianated very minimalistic approaches, such as SourceHut.
I expect in both these opposite approaches you’ll find resistance to the deeper integration opportunities that FedeProxy provides. In Github/Gitlab case the FP openness is against walled garden / vendor lock-in, hence a threat. And on the minimalistic end there’s little interest for the extra ‘bells and whistles’ (in their opinion).
Codeberg is integrating CI (see #428) and this might just lead to adoption in Gitea, who knows.
The question is the level of integration you can achieve for third-party extensions, and for native features any forge project will be very hesitant to ‘just add the feature’. They should fit a clear product roadmap and tie in well to services offered to the users/customer. Many features won’t fit, I think.