Why? I'm allowed to stand at a street corner and watch people walk by. I'm allowed to count them, and observe the direction they're going. I don't need any of their permission to do this. I'm allowed to know who they are, and I'm allowed to tell anyone I want what I saw. I'm allowed to charge money for it, and none of the people I observe are a party to this at all, so why should I need to either not do this, or tell them what I'm doing or ask for their permission to remember what I saw? How is internet tracking different?