Yes, nostream support pubkey whitelist to make it semi private https://github.com/Cameri/nostream (anyone can read, only whitelisted member can write)

Furthermore, with NIP-42 can make relay more private (read and write only for whitelisted)

https://github.com/scsibug/nostr-rs-relay

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Thanks! NIP-42 sounds interesting. Could bring in new use-cases like paid groups

Agree, lets say we have family group relay, company group relay, etc. Just need to wait all relay and client implement this NIP.