I think the answer may be…

Now the some relays of Nostr communication are being interconnected.

In the past, repeaters only forwarded user posts, which was a C-R-C（client to relay to client）

process.

Nowadays, there are some relays that only take on the responsibility of forwarding user posts to more relays, such as C-R-R, and then the relays send them to the user, which can be called proxy relays.

They do not store data themselves, but simply forward client messages to the actual relay.

For example, purplerelay.com and

relable.org These relays achieve true interconnectivity.^_^