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False. The protocol doesn’t forbid it. Theres actually a negentropy NIP for relay sync.

Did you read the actual protocol or are you just making things up on HN?

I also remember reading somewhere that relays aren't allowed to copy other relays.

There are relays built with copying from other relays as a main feature. Personal use only https://github.com/barrydeen/haven This one will copy every note of every person you follow, plus their follows. https://github.com/barrydeen/wot-relay