There are legal things, but not necessarily legal things you want. Anonymous transfers across borders that move quickly aren't illegal even if criminals do use them, and I could see some cases where they could be desirable. For example, if you were sending money to a friend in an area where the existing financial system wasn't working, such as a war zone, you could accomplish it with cryptocurrency. I've never done that, it's likely you haven't either, and you may not be willing to allow the risks inherent in cryptocurrency so someone else can, but it would be legal.
Biting the hand that feeds IT
