while neat, it's a boon to spammers and other nefarious actors who can use these techniques to further get around captcha... concerning to say the least.
if we want to defeat time-wasting and privacy-invading captcha and the murky ethics aren't a concern, then we should go to every e-commerce site that employs them, with full crap-blocking privacy mode on, load up on products/services, and then abandon our carts at the captcha.
maybe we can have botnet operators take this idea and run with it, despite the murky ethics.