The next feature I’ll add to #python nostr-relay will be “dynamic allow lists”, so that relay operators can specify nostr queries, and every “p” tag in the returned events will be allowed to post to the relay.

This is a generalization of the “friend of a friend” feature. It would allow for many other policies, based on whether a user has paid, or some other rule I can’t imagine.

https://code.pobblelabs.org/fossil/nostr_relay/doc/tip/docs/foaf.md