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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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this arms race can only end in the arrival of bots that defeat captcha by being smart enough to pass a full-fledgedturing test,at which point all parties are suddenly going to feel very very silly (which btw I'm unbothered by and in fact am tempted to endorse it just for this)
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