And when they realized what it was doing, they fixed it so that it no longer connects the two. It is a requested feature, as well as a very handy one to have.
Don't get me wrong, I do not allow any program to "call home", but the majority of people do not care, favoring the ease and convience of "self-updating", "DB query" and the ability to be recognised upon return to a site.
What is the worst that could happen even if they DO compile a list of all the movies you watch? They going to send you an email telling you how bad your taste in movies is?