I wonder: what if some huge site uses Google #captcha, but requires it to be solved _incorrectly_?
It will still work: robots either won't attempt to solve it or, having high solving success rate, will fail. And users will still have no problem with it (as long as it's clear to them that it should be solved incorrectly), while #google will get incorrect statistics and hopefully break in some way.
@AMDmi3 *evil grin*