I assume its because audio captchas are so easy to break with a computer (hence you have to distort the hell out of it): http://blog.wintercore.com/2008/03/05/

I assume its because audio captchas are so easy to break with a computer (hence you have to distort the hell out of it): http://blog.wintercore.com/2008/03/05/breaking-gmails-audio-captcha/ http://blog.wintercore.com/2008/03/05/breaking-gmails-audio-...