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It's definitely semantics, but nostr nodes only own a copy which AFAIK is known to be a copy because it's signed by the owner. If you want to say something you're afraid of being associated with you can always use a one-time pubkey, can't you?
why wouldn’t the nodes hold a read-key to the original, rather than a copy? That way the owner can at least revoke the read-key AKA tombstone their data on the node.
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There is no difference between the original and a copy in a digital world.