Keybase claims to be a modern replacement for PGP yet I don't think they even have some SDK that acts like gpgme. This is a very rudimentary feature to implement but it can unleash a whole new world for applications that use signatures and E2EE.
Keybase is a good idea and they got lucky with getting popular but they haven't really implemented features that would make them essential. Most people just sign up and forget about it.
EDIT: Seriously why the downvotes without clarifying? Has Keybase adopted astroturfing on HN like Brave and DuckDuckGo?