It's not a prison, you can leave whenever you want and take with you everything that's supported outside github. Git clone and go. The features that attracted you to begin with still attract you, though, so maybe you don't want to.

Compared to e.g. moving a team from one mail server to another, moving from github is remarkably simple.

Thank you sensei, I think that I do understand now.

well it's one where the inmates can leave, but have to come back out of solidarity to the other prisoners :-)