Interesting, but honestly this takes too much time to be a captcha. The longer it takes people to complete a captcha, the higher chances greedy people start looking to inject ads into it. I mean, they already do, but like, worse. Afterall, captchas are not "skippable," and therefore ads in a captcha cannot be skipped.
Id rather not live in a world where verifying I am a human means I need to be subjected to 27 ads just to find the one thing I need to click on to prove I am, in fact, a human.