Oh please, what a total joke of a comment.
> Google doesnt care about it, they are totally OK with it
Google hasn't said they don't care about it, where did you see any of that ?
They merely allowed the code to be released despite it still working against the current. Previous experience (namely the original uncaptcha) prove that they intend to find a way to fix it.
> You can see here that captcha doesn't block robots, but blocks people and makes browsing inconvenient.
Total BS, remember it's not Google that uses it, it's website owners (us), if what you claim was indeed true we wouldn't be using it, we would use something else that did what we wanted.
> reCaptcha is a way google mines data from us for free.
Of course, through the visual selection it displays when "unsure", although I do not know the detail it seems pretty obvious that once it's sure you're human it sometimes ask you to detect things in picture anyway so as to provide training data (for maps, waymo, image search, whatever ...)