Cloudflare Learning Center
How does reCAPTCHA work without any user interaction?
The latest versions of reCAPTCHA are able to take a holistic look at a user’s behavior and history of interacting with content on the Internet. Most of the time, the program can decide based on those factors whether or not the user is a bot, without providing the user with a challenge to complete. If not, then the user will get a typical reCAPTCHA challenge.
If I were stopped and asked on the street to choose a CAPTCHA, image recognition reCAPTCHAs are by far my fav CAPTCHA. I consider it a success on my part whenever I’m confronted with these. Don’t get me wrong, these are annoying af, but it signals to me that they know little about me, something I go to great lengths, and forfeit a lot of convenience to achieve.
CAPTCHA me if you can.