Maybe you need read this thread
captcha, this topic already discussed. And if you're face trouble with Google captcha just PM theymos, maybe he will fix it
Thanks, my apologies for repeat thread.
Give us an example of a better captcha/system that can't be abused by bots/bruteforcers, I'm sure theymos would love to hear it over you complaining.
It seems to me that any of the captcha services listed on captcha.org would be better than google's offering solely based on the fact that google's captcha immediately makes bitcointalk unusable by a billion people. A quick search shows most people complain about reCaptcha because it is the slowest and most annoying, even if it isn't blocked.
SweetCaptcha, Confident Captcha, areyouahuman.com, nucaptcha, all get much more favorable reviews everywhere I looked.