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From my understanding, the “I’m not a bot” box checks your over all mouse movement and stuff to check if it’s natural
When the chapta is just a checkbox it means that chrome/safari has already ratted you out as a human long before.
They do also check mouse movements and the likes, tho. They also check how quick you are to answer
The more advanced versions can log your mouse movement activity and general behavior while on a website long before you even get to the box.
It also checks your browsing history.