Thanks for doing this. I would like to see more options, e.g. downvote if >X% and > Y pending payout. Then confirm the list, select a voting % and downvote.

Ideally, I would wish to see a full-fledged project around this, that's run by people with updates on a daily basis. Finally, Steemit should consider running a large scale vote on opinion on these bots. I'm willing to bet a majority will want these gone, at which point they would be well justified to start devaluing bot votes from the trending page. People will cry censorship, but it's not really - it might even give others the motivation to start their own competing frontend that champions vote trading.

At the end of the day, the buck stops with the delegator. There needs to be blockchain level changes that make it less profitable for massive whales to delegate to vote trading. Instead, they should be incentivized to either vote themselves or delegate to those who curate on merit. How this can be done - I don't know, but this should be the goal.