The model NOSTR uses is more like what you expect, then. One Private/Public key-pair is all you need to fetch data from, and upload your own posts to all NOSTR

The model NOSTR uses is more like what you expect, then. One Private/Public key-pair is all you need to fetch data from, and upload your own posts to all NOSTR relays. The only complicating factor now is that, to prevent spam, some relays [0] are requiring a one time or recurring payment. [0] https://relay.exchange https://relay.exchange