@atomicpoet models.
In effect I think nostr relays will end up with a fediverse style gossip, you write to yours but it then the relay sends copies to the relays used by users who want to follow you.
The big difference is that in this system the server isn’t in control of your data, identity, and follow graph.
But there will be “bad” relays that the others refuse to federate with and clients might end block at the app levels. Think a church relay might block the sex worker relays.
But…