BlockedIn
Especially if it works.
More seriously, it's cool that keybase solved the identity problem. It's traditionally been a very hard thing to know for a fact that you're speaking with a certain individual, unless they were compromised.
They also have an encrypted github now, which functions very well. And one of the only realtime chat messaging systems where you can open private chats with whoever you want, if you know their name.
Point: I think Keybase might increasingly take over the role that github currently fills. It's hard to imagine now, but people underestimate the effect of 10 years. And keybase seems to suddenly have a lot of assets that are very appealing, especially from a crypto standpoint.
If I were trying to topple governments with code, most of my work would be encrypted on keybase, and my comms (what little there would be) would be via signal. But my identities would be proven via keybase.
One smart move for gitlab might be to create some kind of realtime messaging system for programmers, similar to the niche that slack communities currently fill. Slack never seemed to embrace the community model -- you have to use hacks just to host a slack community, and then you don't get search for more than 10k messages, which vanish quickly. Discord has been eating Slack's lunch from a technical and user count standpoint (though perhaps not profit). Gitlab could compete by rolling out what slack should have been: an open community-oriented comms service with tools programmers love, plus a place to host your code. Discord doesn't have that, and keybase doesn't have very good support for teams yet.