There's no way to automatically determine whos a bid bot as I tried to point that by asking how the consensus will form for who's a bot and who's not and will it be determined through stake or account voting or a combination. Retaliation can be countered by upvotes. A simpler way would be to burn your free flags and they will be distributed among your witness votes, with witnesses then being able to funnel the effort into one account creating a massive stake with enough weight to deal not only with bidbots but all self-voting abuses.
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