the single most important criteria when replacing Github

Consider all the data that's used to provide the value-added features on top of git. Issue tracking, wikis, notes in commits, lists of forks, pull requests, access controls, hooks, other configuration, etc. Is that data stored in a git repository?

^joeyh.name I also agree pretty much with the sentiment in

About Github's embrace and extend of git, and how it passed unnoticed by people who now fear the same thing now that Microsoft is in the picture.