I have been using the blog commenting method to build backlinks and improve the keyword ranking of my website on organic search result. When I post the comment in blogspot websites,the captcha segment has appeared on the comment box. If I do not give the correct captcha , my comment will not update on the post. But, the captcha segment has not appeared in the past 2 days while posting the comment on blogspot. Has Google removed the captcha on blogspot when comments are posted?