I think this has to be both a client and relay side feature, not a bot. A relay may add a tag to an event to say that it 'thinks' it is a spam/nsfw.. A bot solution would be too much unnecessary traffic. A mobile client can't have necessary ML burden. best place is relay imo.
Nah... Too much centralization into relays.. we need external players.
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actually just realized adding a tag changes the event id. out of the question. but a bot has to close to a relay for the sake of speed.
how do we find the users with highest integrity?