In addition to the questionable morals of such a system, I think it is technically flawed. Most captchas work because the words they present to users are mostl

In addition to the questionable morals of such a system, I think it is technically flawed. Most captchas work because the words they present to users are mostly random assortments of letters. This one, however, presents real dictionary words. It is pretty conceivable that a bot, armed with a dictionary file, would have a pretty high rate of success correctly identifying at least one of the three words. If it then randomly chooses one of the identified words, it would have a rate of success at solving the captcha nearing 33%. This is extremely high when your bot is trying to solve thousands of captchas per minute.