The simplicity of it is logic defying. It used to be that you had to find crosswalks or move puzzle pieces or type blurred letters and numbers, but NOW all the sudden I can just click a box and HEY!, I’m human?
That’s hardly the Turing Test I’d expected.
I kinda think your browser makes sure you at least click before websites are allowed tracking things like your cursor.
I think the clicking is rather the part where you agree to allow your history to be checked, essentially.
Sorry for linking Reddit, but… https://www.reddit.com/r/askscience/s/Ws3Mr45qFV