If you are logged in to your Google account they are pretty much tracking everywhere you go and everything you do online, reCAPTCHA or no reCAPTCHA.
That's true but a reCAPTCHA on a site login page tells them something that I don't think they could know otherwise. I'm only speculating about that but the point I'm trying to make is that Google makes reCAPTCHA available for free because of the data it harvests for them.
Anyway, we're going way off-topic here. Freebitco.in don't save any money by removing captcha or offering RP rolls as an alternative. Google love or hate can live in a thread on another board.