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To understand the depth and complexity of Captcha2 I highly recommend this: https://www.quora.com/Why-cant-bots-check-“I-am-not-a-robot”-checkboxes https://www

• zrm 7y ago
  So the short version is that they try to fingerprint the user and then distinguish fingerprints that seem like humans from fingerprints that don't. The interesting question then becomes how this is going to interact with future browser anti-fingerprinting measures whose purpose is to prevent just that.