GM
Decentralization is not about communication network topology, like p2p, hub/spoke, torrent,.. Its not about how data is being transported. Decentralization is about *minimizing* the trust that is required between participants. Its about decentralizing the power that comes with being trusted. In nostr everyone verifies authenticity of content themselves. No need to trust a central authority to have checked a password. Nostr is like everyone having their own twitter. Relays are just dumb infrastructure (like tcp/ip router). Relays don't have much power.