Why can’t bots solve captchas?
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Captchas are less about definitively proving you are a human and more about blocking the most obvious bots while getting you to do free labor.
Many of these captchas have you train a model for computer vision, seemingly for self-driving cars: identify the traffic lights, cars, bicycles, etc.
What I don’t understand is how it knows the right answer already … and how we can tell it when it is incorrect. One time a captcha asked me to identify taxis. It included an image of a yellow pickup truck with some black details. It was not a taxi! But I couldn’t move on until I selected it.
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