By my definition Nostr is decentralized
It can be to different degrees 1. Connect to 1 relay (centralized) 2. Connect to 7 mega relays (a bit less centralized but arguably still centralized) 3. Outbox model, 1000s of community relays: decentralized 3. Outbox model, lots of people running their own relay: a cypherpunks-wet-dream decentralized The flexibility is the most interesting thing to me