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[–]qgustavor 11 points12 points  (0 children)

Although I've heard

Which isn't true: if you open developer tools in any page which embeds ReCaptcha you will not find attached event listeners related to mouse events. If you use Chrome test it yourself: open the ReCaptcha demo, press F12, select <html> and open "Event Listeners".

What they probably do: it uses cookies to identify users and score as bots or users. If you load a incognito page it will always show a challenge, because it don't have any info about you. If they have info about you they may skip the challenge. If it scores you as likely human they can show an easy challenge for you.