Unless the blacklists/whitelists are completely managed by humans then I cant see this working.. to much chance for errors - and I cant see them being managed by humans because of the costs involved.

I like the idea of having a limit on how much bots can be used per day/week. Maybe 3 bots per week or a maximum SBDspend per week. This would put everyone on a more level playing field, and would prevent some of the mass abuse where people spend hundreds of SBD to get their posts to trending