Networking without the internet. "Better Approach To Mobile Ad-hoc Networking". Is a routing protocol for multi-hop ad-hoc mesh networks.
B.A.T.M.A.N. will work without centralized DNS.
It will work without central servers.
It's unknown or not applicable as to how user accounts are handled. It's unknown or is not applicable if B.A.T.M.A.N. supports cryptocurrency monetization.