The userbase is also changing. There are vast numbers of new users on Github who have no desire to learn the architecture or culture of the project they are contributing to. They just spin up their favorite LLM and make a PR out of whatever slop comes out.
At this point why not move to something like Codeberg? It's based in Europe. It's run by a non-profit. Good chance it won't suffer from the same fate a greedy corporate owned platform would suffer?