Somewhat predictable move. Buying a security company (on the cheap with Keybase) is an easy way to advertise “See, security now!”. It’s a fast-track solution to slap some duct tape on the problem and at least say they fixed it.
They bought Keybase to bring on a strong security team as they try to build end-to-end encryption into 1,000 person meetings which is currently not possible with any solution.[1]