Captcha has issues in that: - captcha that isn't hard for humans is often easy to automate - captcha that is hard to automate frustrates a lot of humans too

Captcha has issues in that: - captcha that isn't hard for humans is often easy to automate - captcha that is hard to automate frustrates a lot of humans too - and to add insult to injury you can "automate" the hard ones too by paying like $1 per 1000 captchas or something (think Amazon Turk like stuff)