For the last 30 years, CAPTCHA has done one job: make a machine fail a test that a person passes without thinking. That job is over. Researchers, testing automated solvers against Google’s reCAPTCHA v2 image challenges, reported a 100% success rate, up from roughly 68% to 71% in earlier work, and found no meaningful difference between the number of challenges a bot needed to clear and the number a human did. If we think about CAPTCHA as a stand-in for an entire category of control built on the…