Or, maybe Keybase needs video, and Zoom needs chat and security, in order to compete with the new wave of “productivity” suites. Why would Keybase suddenly be a failure or get worse in the security department because they are owned by a successful video conferencing company?
It's deeper than "Chat Security". There is current litigation against Zoom marketing of the misuse of 'end to end' encryption. This is the best way forward of claiming ineptitude and their path to rectify.