I am sure there are ways to design such a system that precludes tracking. For example, suppose I have a browser that includes an extension that does this: I wan

I am sure there are ways to design such a system that precludes tracking. For example, suppose I have a browser that includes an extension that does this: I want to visit U (some url). My browser sends a request to the no ad service to see if U has signed up. If it has, then it sends me a once-only token. I send this as proof of status to U, and they send it to the no ad service to claim their micro payment. The only parties who know I have visited U are (a) my ISP - I assume all requests probably go through them; (b) the no ad service (actually, all they really know is that I asked for a token); and (c) U, of course - although all U knows is my IP address, nothing else. Anyway, that is roughly how such a service might work. I am sure that even better safeguards could be designed into it.