They combine your browser fingerprint (what extensions you have installed, version, etc), your IP address, and how you move your mouse, how fast you click, etc. It’s surprisingly accurate.
laundry861
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Cake day: 2026年4月1日
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None of these are about identifying if you’re human, they’re about identifying which human you are.
Browser fingerprint (mostly) identifies the device. The captcha is to narrow that down even further to the person.