And, just to guess, he's also pointing out that security is not a feature that can be "bolted on" to a chat app later. Secure messaging is an incredible deep sp

And, just to guess, he's also pointing out that security is not a feature that can be "bolted on" to a chat app later. Secure messaging is an incredible deep space, and any attempts to add security to a chat application will have far reaching implications on features and usability.