The entrenchment here is ridiculous. The average software engineer does not care at all about their vcs or their forge and their knowledge of both is extremely shallow.
For the people who want to do their work and get on with their life, it does not really matter that much.
Exactly. I run my own Gitea server, but put my stuff on Github, because that's where the people are. Self-hosting an MP3 is not the same as being on Spotify.
I keep my open source work on github for similar reasons. I don't expect nor want to deal with contributors having to create accounts on a self-hosted forge for every individual project they work on.
For the people who want to do their work and get on with their life, it does not really matter that much.