At a high-level it’s simple: Cryptography combined with peer-to-peer routing. Cryptography provides private communication and sovereign identity, and peer-to-peer overlay routing provides censorship resistance. The technology already exists for direct, verified, and private communication between peers over any network topology.

The challenge is combining the aforementioned technology into an accepted standard and intuitive user experience. The business model would be straightforward hosting. A major barrier is the lack of funding to get it off the ground.