The same reason every new MMO is labeled a WoW-killer. Anything new is going to be branded as better than its competitors, the problem comes when there's a competitor that's so much bigger than everyone else in the market, where you'd have to kill it to actually beat it. You can't exactly market as being worse than your competitor.

I've seen a couple of good CAPTCHAs that ask a simple math problem, or a traditional CAPTCHA, but then say 'leave this field blank' on the actual entry field. A bot sees the field and has a crack at solving the thing, whereas a human can ignore it and carry on.

Would make extracting the image and getting someone to answer it worthless as well, as a bot with those inputs would still answer something in the field regardless.