With nostr:npub16fcy8ynknssdv7s487nh4p2h4vr3aun64lpfea45d7h4sts9jheqevshgh we focus on high availability by having the geographic relays transparent to users. All notes are streamed (synced) across all relays we run. But Brazilian users, for example would all connect and benefit from a short number of hops to their geo relay.

I do think in the future there may be special interest relays. Or ones with select users with write access but these should still stream to other "Tier 1" relays. Big relay operators need to commit to streaming between themselves or will end up with centralized silos.