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Do you mark the top left square?
I never know to click if there is only a tiny bit of bus/firehydrant/bicycle or whatever, in the square. And the CAPTCHA doesn’t seem to be consistent about it either.
The captcha test typically isn’t whether you can correctly identify it, it’s whether your actions on the computer appear to be human. Hesitation, moving the mouse like a human, etc. Which square you pick, doesn’t matter in the end. However, I do believe they have used that for training data to help AI.
I thought they used a crowdsourced database that weeds out incorrect answers. So if 86% of users that are shown image_1234.jpg with type BIKE select it, and you are shown 1234 but do not select it when you are assigned BIKE images, you fail.
