Typically a bot can spam forms easier than a human as they can see the underlying code / bypass things. They can also do it very quickly.
Even just moving your mouse might be enough to determine if you're "real" as its actually quite difficult to simulate realistic movement.
If a bot was making multiple accounts or say voting on something they dont have to navigate thr page, they know what a submit button is and can directly select the object
Ben-Z-S t1_jac7qlj wrote
Reply to eli5 What is the purpose of those little “I am not a robot” buttons. Can a robot seriously not detect and click them? by Lord-Zippy
Typically a bot can spam forms easier than a human as they can see the underlying code / bypass things. They can also do it very quickly. Even just moving your mouse might be enough to determine if you're "real" as its actually quite difficult to simulate realistic movement.
If a bot was making multiple accounts or say voting on something they dont have to navigate thr page, they know what a submit button is and can directly select the object