pewdiepie is basically an outlier, most other people do not make NEARLY as much revenue as he does fom his videos.
I don't know a single person who watches his videos. How he has this many subscribers is a conspiracy I say!
Anyways this situation is basically the age old problem that if you sell someone a product and they use that product to make more money than the person who sold it to them with said product, does the buyer have to then pay the seller some royalty for making money with said product.
The answer depends on ones ideals, and generally if they're a seller or a buyer of things. In this case though I've always believed that once you sell something, you sold it, and how someone chooses to use it, isn't yours to define. If they're smarter than you and manage to get more money from it then you did, sucks for you.
In this case its even more obvious that nobody should care because in this case the seller will likely make even more sales as a result. Where exactly is the problem?