When I first read this was I was troubled, and I am certainly a Google critic, but it seems to specifically say this is for your usage only. It's not being used for their ad network or for them to see behavior. It's used in the same manner as tracking packages, etc. If or when they start using this for their own internal usage to see use purchasing behavior, and telling adwords customers what purchase/products were popular so they could convert, that's when I'd have a major problem with this. As it stands now, I don't see it as a major problem.