Serious question: What is the point?
Just push into half a dozen mirrors and you are pretty censorship resident without the crypto voodoo put on top of git.
Github has one huge value: Discoverability of a project. This is even worse than hiding your project in one of the smaller forges... nobody can remember the mess of letters you need for this.
No, I would prefer a world where not everything is concentrated on github, but that is the world we have to work with:-)
But how does this address any of the problems you brought up?
Do you think a project will be more discoverable when you say: "Clone foo/bar from github" or when you say "install this strange crypto-BS, then clone rad:xyhdhsjsjshhhfuejthhh just like you normally would"?
Apart from discoverability you get a known workflow for contributors, a CI and a bug tracker. Coincidently those make it hard for projects to switch away from github... how does this address any of that? "Use this workflow, which is even wierder than any of the other github alternatives!" and "just set up a server yourself"?
Sorry, this is just yet another crypto-bro solution in search of a problem. Technically interesting, I'm give you that, but useless.