This begs the question: when will we see a version of Delta Chat that is fully P2P, essentially a mail-server-in-my-smartphone. Sounds like a stupid idea until it doesn't. If the phone of my correspondent is up, no third-party. If it isn't, I can contact their backup, vps-hosted mail server thanks to... MX priorities. Everything is there already.
@rakoo stay tuned :) but we will not compromise on reliability, efficiency and ease of use which means we tread carefully. Instead of a distributed hash table (dht) we are to use the massively scaled e-mail system for bootstrapping P2P connectivity and paradigms. Any P2P system needs a bootstrapping mechanism, if not email it would be "root" servers and they are way less federated and decentralized than email :) but more when the time comes as we prefer delivering working code not ideas.