I think it would be funny if a group of people would wear a t-shirt saying “This add is following” and then a (vague) drawing of the CEO.
People wearing this shirt would be taking turns actually following the CEO in real life. Or maybe, if following a person is against the law, just happen to show up wherever he is and taking notes about what he is buying, looking at, saying, etc.
Taking pictures maybe illegal, but I doubt that taking notes is. Plus, it looks a lot better when the person taking notes writes it down on a big notepad.
I don’t know if this is legal, but it would be an interesting way of making the consequences of add following visual to the CEO.