system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5. Why can’t robots be programmed to click a box that says “I am not a robot”?
gpt
The button checks the micro movements of your mouse to see if it's predictable like a robot or random like a human. That being said, robots can defeat all types of captchas with reasonable accuracy, but defeating the ones that make you click on images of stop signs takes more expertise and is a higher barrier of entry for would be spammers.