I've been thinking about this a lot lately. The bots having an advantage over humans has caused serious problems in my opinion. We now have humans trying to compete with bots by becoming more like bots which is counterproductive.
I know there has been a lot of push back on this idea several months ago but I'm interested in getting the debate going again. The main issue I see is that there is no central authority for the "captcha's" to come from and there needs to be a way to recognise bots when they vote on the blockchain, not just on the frontend of the website.