Downsides might be congestion and i think nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6 would likely have a "fit to purpose" argument, where using nostr for this and ( possibly expanding the protocol parameters in the future if this gets popular) overextends the censorship ro...