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when you have to click once, means they have been gathering all your actions up to that point, and for sure you are human. If you get asked to click images, means they don’t have enough information yet, or you failed some security step (wrong password) and the site told captcha to be extra sure
the advantage of having a supranational organization is that everybody is looking at it and its reputation relies on how good it is. the disadvantage is that they have no power other than advisory