The Curious Case of the Bizarre, Disappearing Captcha

Captchas have largely vanished from the web in 2025, replaced by invisible tracking systems that analyze user behavior rather than asking people to decipher distorted text or identify traffic lights in image grids. Google launched reCaptcha v3 in 2018 to generate risk scores based on behavioral signals during site interactions, making bot-blocking technology “completely invisible” for most users, according to Tim Knudsen, a director of product management at Google…