That works if your ads have a physical location in space, like a billboard or a radio station, so that you have a place to go when you decide it's time to shut them down. You can't even get a stable URL for a web ad. Where are the cops gonna go? How many different "not my problem try this guy" hops are they gonna have to traverse before they find somebody who actually did the bad thing, how many different countries will they have to visit while they do so?

It only works if you re-architect the web into something that's even more censorship friendly than it currently is. I hate ads too, but the medicine seems worse than the disease in this case.