er, what i mean is, i don't think it should be optional. can we trust nostr clients more now than before everyone started vibe coding? no, it should be MUST not SHOULD. or you are not NIP-01 compliant and that should be avoided.
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in fact, to spite these people not providing this, i could make a little app that lets you log in and it tells you which of your relays are clown operated garbage.
what i think should be optional, is how many are kept. for most users 10 would be plenty to back them right up.