Oh, one more thought.
Implementing a capcha in the core of the blockchain would make all bots just go away and crawl under their respective rocks for all time.
Of course, something like that would have be be thought through very, very carefully with a long period of public comment.
Yeah, I thought about that. but some of the bots are not necessarily bad. Even juicing a post with a FEW purchased votes wouldn't be so bad, but when 20% or more of the reward pool goes to purchased votes, no, that's not cool, because those whales should be risking same as us to earn that money. And that money should be going to content selected by the community.