I have been watching the bot tracker and I have not seen an over bid bot yet. I hope people are now watching their bids carefully.
I'm sure most upvote bot owners are trying to find a solution to it also.
Easy fix just a line of codes --- if total bid >= bot vote value then reject more bids. Return over bid - type memo - bot vote value already reached by $value bid again after 'hours'minutes'secods
However, I was told by someone that it was already done before but people kept complaining that they can't put a bid on.
I don't think the bot owners will put the code that stop bot accepting bid when it reached the value because they will lose money that way. If people over bid more money goes to the bot, more profit