I used to hear that Captcha was intrusive, and who knows? The victim would be the last to hear. AI offers this:
Modern CAPTCHAs (like Google's reCAPTCHA or Cloudflare's Turnstile) use advanced risk-analysis engines to separate humans from bots. Instead of scanning your PC, they analyze your interactions:
How your mouse moves across the screen as you approach the checkbox (bots move in perfect straight lines; humans have micro-shakes).
Browser environment: Your browser history canvas, screen resolution, and language settings.Network data: Your IP address and general location to see if the request is coming from a known malicious network.
Cookies: Active cookies from the CAPTCHA provider (like Google) to see if you have a track record of normal browsing behavior.
While some privacy advocates criticize modern CAPTCHAs for tracking user behavior across the web to build ad profiles, this tracking is strictly limited to your online browsing habits, not your local computer files.
Note the weasel word 'modern'. So no straight lines - do some screen burnouts maybe, have a 'normal' browsing history - who decides?, and whatever else that is left unsaid.
As (inventor of email) Dr Shiva Ayyadurai says: 'the future is offline.'