Isn't the ["-"] tag be sufficient for topical relays to filter out rebroadcasts? It doesn't prevent generic free-for-all relays from accepting topical notes, but it surely allows topical relays to be selective about what it will accept according to the user desire.

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- doesn’t signal anything, this is like sending and email with To: -. This doesn’t mean anything. Id be happy with a p tag with relay pubkeys.