Both Radicle and Tangled miss the point; these are all for public collaborative work, but what about private repos? Many users work on side projects; they use GitHub private for this. Once you learn GitHub, then you also start public projects on GitHub.

The point I am trying to make is, until you offer a user the ability to make a private repo for side projects, it's unlikely to take off.

What people want is the ability to make a private repo, go away for a few months and come back to find their repos right there waiting for them.