Sites get to set the captcha security. There's 3 tiers. The highest one will always bug the user, the lower one will almost never do it (unless it's a specific

Sites get to set the captcha security. There's 3 tiers. The highest one will always bug the user, the lower one will almost never do it (unless it's a specific flagged IP). Default is somewhere in the middle, but I'm guessing that site has it set to the highest. The person you're replying to has a different issue. The way the one button captcha works is by using your cookies to try to figure out if you're a real human user or a robot. If you clear your cookies, you'll almost always get the captcha.