What are your thoughts on integrating encryption into existing messaging platforms?

A privacy activist is building a project called Ekko that aims to integrate encryption into popular messaging apps without requiring users to switch platforms. The goal is to enhance privacy by allowing users to send encrypted messages while still using their favorite apps. This approach addresses the challenge of user adoption by leveraging existing networks. What do you think about this method of enhancing privacy? Can it effectively solve the network problem? What potential challenges do you foresee?