Thanks!
I'd like to add data encryption at rest, but thats still a work in progress. A previous post on the matter: https://lemmy.ml/post/22209501 .
I hope to improve the project over time. A roadmap of possible capabilities can be seen here: https://positive-intentions.com/blog/introducing-decentralized-chat#roadmap-the-future-of-secure-file-sharing
I'm motivated to work on the project because its interesting, but it seems this project is not sustainable open source and so I'm investigating options in how to go forward.
(The chat app repository will still remain open source. Making it close-source would undermine it's security claims.)