Captchas were designed to distinguish bots from humans. But that's no longer the problem[1]. You've just got to assume even a "bot" is human now. Casinos don't

Captchas were designed to distinguish bots from humans. But that's no longer the problem[1]. You've just got to assume even a "bot" is human now. Casinos don't spot many cheaters at the door, but rather spot them in the act by monitoring their behavior. [1] Though still an issue, I don't think removing them totally would do much good, you still dont want people cause semi-malicious damage of your site for even non-profit reasons, such as the Time 100 poll which has been gamed by 4Chan (not that Time introducing a captcha has stopped them though, just slowed them down — however I highly doubt they'd have started it if the captcha was in place from day one)