Clicking the box is rather the frivolous part of what those CAPTCHAs are looking for. In reality, what they are really looking for is things like did the 'user' instantly move their mouse to the exact position of the box or did it move through the page like a human would.
source https://rb.gy/kzfc62
Did the user scroll to the box, or are they executing JavaScript to trigger a scroll to the box?
How long after the page load did the user find the box? Too quickly is a red flag, so is talking too long.
So basically it's impossible for a bot to solve reCAPTCHA, because it's hard to replicate the movements a human would have. Maybe in the future, who knows.