> It’s just yet another centralized service

Yeah, collaboration usually requires some sort of centralisation. Whether that is the LKML+git.kernel.org, gitlab.gnome.org, salsa.debian.org or Sourcehut, or GitHub. At least Sourcehut isn't completely proprietary and shoving AI down your throat at every possible chance. The same can be said for Codeberg and almost any GitLab CE, Gitea or Forgejo instance