I honestly don't like the UpBots... It's cool to get 50 likes on a post, but not if they weren't by people that read your post. Comment bots are the same in my opinion.
I don't think the use of Captcha would be good for morale - or if it would even be feasible. I know next to nothing about programming.
What if there was a way to make known bot accounts votes and/or comments not eligible for curation rewards. Or perhaps increase the regeneration of voting power by 10 to 100 times or something. That way, the quality content posts won't be affected as much?
Either way, thanks for being AWESOME Dan!
YEAH BUDDAYYY!!
-bigedude
Also captchas wouldn't work. They would stop people. Bots are using the API. You can't captcha an API because specifically it's intended for a bot. The one running on your computer right now, reading the websocket connection and giving you updated content and commentary courtesy of the steem blockchain.