I have noticed that some CAPTCHA pages, like Cloudflare’s, simply ask you to check a box to proceed. There is no clicking on traffic lights or entering characters. How does clicking on a check box tell them I am not a robot?

  • How you move or type is one reason. I only ever get challenge things when I am using remote desktop which recently changed how keyboard input is sent. Instead of going each key like it was being typed on the actual machine, it sends a whole line of text at once. Doing this tends to trigger the automation detection and challenges you with the “find all the traffic lights” bullshit.