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reCAPTCHA: 819 million hours of wasted human time and billions of dollars in Google profits
https://boingboing.net/2025/02/07/recaptcha-819-million-hours-of-wasted-human-time-and-billions-of-dollars-google-profit.html

"Searle's paper, titled "Dazed & Confused: A Large-Scale Real-World User Study of reCAPTCHAv2," found that Google's widely-used CAPTCHA system is primarily a mechanism for tracking user behavior and collecting data while providing little actual security against bots. The study revealed that reCAPTCHA extensively monitors users' cookies, browsing history, and browser environment (including canvas rendering, screen resolution, mouse movements, and user-agent data) — all of which can be used for advertising and tracking purposes"