You can use any nostr relay. Nothing special about nwc
Alby hub generates nwc strings with relay.getalby.com/v1. I cant just change the relay in the string, right? Alby hub is listening to the relay it generates in the nwc string?
You can change the relay for your hub via environment variable: https://github.com/getAlby/hub?tab=readme-ov-file#optional-configuration-parameters You can't just change the connection string manually, since the hub needs to know which relay to listen to for incoming requests.
Gracias!