[steveklabnik]

Ruby historically has not wanted to move to GitHub because core prefers svn to git.

That said, https://github.com/ruby/ruby/ exists, and committers will (in my understanding) take PRs from it and merge them in, see https://github.com/ruby/ruby/pull/1661 for example.

This has happened because the same kinds of discussions have come up with Ruby for years, especially since GitHub came out of the Ruby world, and the Ruby community overall has used GitHub longer and more than most as a result.

There are things that we in Rust find annoying about GitHub, but they're mostly addressed through things like bots; there's no significant push by anyone to move away from GitHub.