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Probably that you're putting effort / brain power into it. I'd be surprised if you could do that without thinking, just letting your fingers move "randomly"

I am doing it "randomly" and maybe 5 presses per second...definitely not thinking. The lowest I have sustained is 43%

You are ready for the next level: misleading recaptcha.

How to do that is explained in the first link.

On the implications they note “Doing the opposite of what a computer tells you isn’t quite free will though!”