It took me about two seconds to create a new repository with Keybase and clone it to my computer, so I'm pretty impressed so far.

Thanks for the info about git-remote-dropbox and the potential failure modes of going without, even if they don't all apply to the way I've been doing things. It's still not ideal, so here's hoping Keybase makes it obsolete. If not, I'll keep git-remote-dropbox in mind.