heh, indeed. Google is the single most dangerous entity in the world. They're great, so long as they remain ethical, but sheer amount of data they have is very dangerous for one group to possess.
I remember a story about Target, where a father called to complain about them sending maternity related advertising addressed to his daughter. Turns out, based on her buying decisions, their computer system had determined that she was pregnant and thus began advertising to her as such. Also turns out, that not only did the father not know, but the daughter didn't know yet either. And all that just from credit card transactions. And that was about a decade ago.
Now, imagine what your entire browsing history and YouTube watch history can be used for.