I am agree about bidbot but not about self-vote. If i like my post, why not vote myself? For both cases the problem Is that they are permitted from Steem algorithms. Don't forget Steem Is a decentralized system and therefore rules are announced at the beginning from founders and translated in programming code. To change them there is a consensus rule that produce new hardfork. Now, is very simple change the code to not permit the author of a post to vote himself but after 21 hardfork It Is not happened. Why? Perhaps nobody of witnesses et al. think it's an abuse. About bidbots I think Is difficult to fight them through the code and I have not an answer at the moment.