> It can be difficult to communicate that each nostr app is a interface onto a single common database, rather than a separate silo.

But this isn't the case, is it? Each relay is a separate silo. Nostr's website says: "Clients fetch data from relays of their choice and publish data to relays of their choice. Relays don't talk to one another, only directly to users."

Or have I misunderstood?