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In the blog comments for SO and other blogs, I’ve noticed a trend in some users posting what the captcha was that they had to solve to get their post accepted.
Are they doing this in order to aid captcha-breaking bots?
If so, is there a way to programmatically (server-side) compare the users’ input to the captcha to strip it out of the comment? Is that worth the effort?
No. Captchas are only valid captchas if they can automatically generate new puzzles so posting the answer wouldn’t help since the same puzzle won’t ever be seen again.