Which makes it interesting, and worth learning about.
I feel like internet blackouts are not a distant idea or all that improbable and I want to have some knowledge in my back pocket just in case.
Fixed ad-hoc routing is a little better, but tends to be kind of fragile since nodes can appear and disappear at random. I've never found a system that worked as well as I would like, although I think there could be value in a network that separates the high bandwidth user data from the low bandwidth routing data. Like it uses 802.11 for the data, and LoRa for the routing decisions.
It would be an interesting idea to have a device that could use 802.11 for data when in close enough range. With chips like the ESP8266 you could still have a relatively low power device but with much greater bandwidth.
I might not be thinking broadly enough here though.
Especially given in an environment like this it'd be used mostly to get the initial connection, performance probably wouldn't be too big a problem.
Careful with those words. Experience taught me that if there isn't a reason to ever want to do that, reality will eventually provide you with one.
There's no reason to ever revoke control for messaging systems, though, genuinely: imagine if your e-mail address could be taken on a whim by anyone. It can be! But you'd never want to revoke control of a domain rather than just marking it as spam or illegal and dropping messages from it. It functions as an inbox more than it functions as an outbox.
Addressing space should be permanent.
A domain in this case is akin to a hash of a public key, or something like that, just enough to securely identify the target of the communication so there’s nothing to “revoke” although that’s not to say the peer discovery systems could not try to blacklist you.
Decentralized DNS with human readable addresses (unique screen names) is perhaps more a political problem than a technical one, and hence never fully “solved” just different sets of trade-offs that can be made.
However, between these two you can only pick one. You can't solve squatting problem without some kind of authority over issued names.