Eventually, captchas are replaced by fully fledged sphinxes, always a little smarter than what they're supposed to let pass because that's what it takes to come up with Turing tests on the spot
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I picture the occasional bot that does beat the captcha being allowed in because the sphinx figures they've earned it
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likewise for the human that fails, "but I really am human" isn't gonna cut it anymore. nope, don't care, doesn't matter, the sphinx has found you unworthy and that's that
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