Captchas also compromise your privacy. When you run across a Captcha, the technology might keep a permanent record of your phone or computer identity that can track everywhere you go online.

Humans also fiddle with a computer mouse or move around a touch screen phone in a “very human way,” Graham-Cumming said, so the ticketing computer might scope out how the cursor is moving.

Not sure why privacy is brought up if it seems to be equally as bad?