Does it includes issues and open PRs? I think this is the most concerning part about Github: when you move somewhere else you lose important parts of the history of the project (that document known bugs, how features came to be, etc), unless you specifically step up and use some import tool.

There are Git-backed distributed issue trackers like Git-bug https://github.com/MichaelMure/git-bug (and probably other tools) that should be more used.

One could perhaps convert Github issues to git-bug and store on a branch of this IPFS Git repository.