If you go crypto don't use git. It's not designed for cryptography in mind and the Keybase approach looks nice IF I can control every chain or can keep using github (or any other git server) with it. But for the storing part alone I would not trust Keybase. I would even say if you do crypto and need cloud storage then store it in multiple places and avoid git. Better flat file and some daily backup strategy with e.g. encfs as the bottom layer. In worst case you get your data back.

Sorry keybase.... you are not a trustable cloud storage for me.

It feels like betting on your company... I want to bet on your company without feeling dependent on worst case restore scenarios (computer dying while your company dies).