@mlfh @cecilkorik Thankfully not everyone has been ignoring the #clearnet unreliability and #infrastructure requirements, so some #P2P program with #AsynchronousCommunication (https://www.complete.org/asynchronous-communication/) do exist, like #NNCP, #SSB and #Briar.
They can all use the #internet as transports... but they don't need it. Messaging over encrypted mailed microSD cards is possible, or over bluetooth while in the same room.
We need more stuff like this, and I unfortunately don't have a good list.