[grumbel]

If github goes down you upload your repo to gitlab and are back in action within 5min. The issue isn't git, but the fact that github does a lot more than just git (issue tracking, push requests and so on) and all of that other stuff centralized.

There is in theory nothing that prevents an issue tracker to be decentralized in the same way git is, but so far that hasn't materialized. You can export issues from github as .json, which allows you to transfer some things over, but users only have a username in those bug reports, not an email, which makes it impossible to contact them after a move to gitlab.