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Cloudflare Captcha - which tests are actually important?
It seems like Cloudflare Captcha (which appears to be using Google reCaptcha) shows two types of challenge: One where it's a single image broken up into tiles, and one where every tile comes from a separate image.
The single image usually gives an option to skip it. From this, I assume that the captcha first shows a "free work" image - the system doesn't know the correct answer, but is trying to get humans to label it for free by pretending it's part of the test. For the multi-image one, there is no option to skip and answering correctly seems required to pass it.
Is this true? What is the single image test used for?
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