Well put! But it depends on how you approach the issue.
If having a conscience means prioritizing security above all else, then Keybase is doomed.
But security isn’t the only thing that matters. Zoom seems to have focused on making a very user friendly product. Keybase focused on making security more user friendly. In many ways, the user focus of both apps is their Prime selling point.
Perhaps they weren’t buying a conscience, they were fixing a blind spot.