The missing piece here isn’t a factor driven by technical logic, but a factor by human logic. It was “cool” to use Slack until it became widely used, and then

The missing piece here isn’t a factor driven by technical logic, but a factor by human logic. It was “cool” to use Slack until it became widely used, and then it was “cool” to use Keybase instead. Zoom is currently seen as “uncool” (E2EE screwup + widely used), so when they purchase “cool” Keybase, now Keybase automatically becomes “uncool” as well and people will look for something “cool” to migrate to next. This isn’t a complete explanation of all possible reasons, but it’s absolutely a contributing factor. EDIT: I predict Riot/Matrix will be the replacement “cool” for Keybase.