Money laundering through things like app sales is a classic technique. It's the modern version of buying "art" that isn't valuable at insane prices. Laundering through an app store incurs a 30% haircut, but the funds are very clean afterward and every money laundering technique is going to cost that much or more. It is not unusual for the laundered funds to be 40% of what they started with.
Pointing out that money laundering is a possibility is fair. I very much dislike Apple, but if it is a potential money laundering situation then their hands have been tied by the US government.