It's not difficult to get passed CAPTCHA's with an automated service. If the CAPTCHA is too difficult then it just refreshes and asks for a new one. I at times have problems reading those, especially with caps/ lower case.
If the intention is to keep SPAM bots out then the best solution is to have a questionnaire during the sign up process. There isn't an automated service that can get passed this as of yet.
If the intention is to keep SPAM bots out then the best solution is to have a questionnaire during the sign up process. There isn't an automated service that can get passed this as of yet.