This doesn't make sense to me. What's a corporation going to do? Try to sell you something? So what? Oh no! Facebook is showing me overly-targeted advertisement

This doesn't make sense to me. What's a corporation going to do? Try to sell you something? So what? Oh no! Facebook is showing me overly-targeted advertisements! The government can put you in jail or shoot you. That's who we need to be worried about. The gov't loves it that all of the (mainstream) privacy concern is about corporations, while honestly that's such a small issue in the grand scheme.