That is all true but for practical intents and purposes you should probably make ad company responsible. It might seem a bit illogical but from practice standpo

That is all true but for practical intents and purposes you should probably make ad company responsible. It might seem a bit illogical but from practice standpoint, it is much easier to pursue and punish an ad company than to hunt each and everyone of its clients. Especially that they can just abandon the company and create new one, and it will be just cost of doing business, everyone of those shady players will have an ad shill company that can be replaced quickly in case of trouble.