I guess they actually cannot prevent it, but you get some fairly obvious warnings. If you use bid bots twice with tasteem, thats on you.
However in all fairness, it would be quite easy for bid bots and @ocdb to ban votes for those tagged with busy, tasteem, etc. Or even with beneficiaries
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Normal bidbots wouldn't do that, its a business for them, they couldn't care less if users lose more money to beneficiaries.
@Acidyo is doing a good deed to remind people but ultimately it's their call, maybe some people really want to promote their post...