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People will always try to abuse things that's why bitcoin was invented and decentralised so if we can't build bots that are abuse proof or at least to a reasonable level i.e 99% then they should not exists and by there very nature they are a magnet for bad behaviour

The other big issue with bot abuse is that it is simply related to how much money one has to start with. It is catch-up because most of us can't really afford to use many of the bots. So as soon as the spammers get going, they can simply stay a head because they now have more money than most people trying to play more fair.