Also, most people collect rain water, drink raw milk, and throw cannabis seeds in soil, all three acts which are considered serious illegal felonies punishable by seriously expensive fines and extensive jail time, possibly life in prison.
Some people also walk, drive, fish, or hunt without a permit that can easily be bought for in USD.
Will this hurt USD in the long run? Will governments ban this just like they started to do with paying in cash for some services to harden the use of illegal activities, and money laundering?
Any currency are been used to any illegal activities aslong it is not fake and acceptable by any banks, and if you travel in different countries well you can see really that they are using their currency to buy those illegaly forbidden by the law. And thats the reason why my conclusion is this since currencies are powerfull and it can make the good to be worst.