About
“I’m Not A Robot” is a phrase accompanying the CAPTCHA service reCAPTCHA, which is able to determine if the user is a robot by the way they click the checkbox. The phrase and reCAPTCHA box is frequently shown with characters who are know to be robotic, showing them being unable to truthfully click the box.
Origin
The reCAPTCHA feature was introduced in late 2014[1][2]