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@eob @blake @snarfed.org

You don't need a public IP address to use p2p. Take a look at NAT traversal (eg in libp2p) which supports connection over TCP behind hike routers.

As for setup, once you have an autonomous network this performs the rule of a server, but using p2p nodes rather than a centralised server.

You can also authenticate with such a network without storing credentials on the network.

There is no reason you can't do away with servers. It is hard, but solvable.