But you can limit conversion of gold/silver into fiat money. I.e. to trade it on any exchange, you need to prove the origins. In the end a mob boss does not wa

But you can limit conversion of gold/silver into fiat money. I.e. to trade it on any exchange, you need to prove the origins. In the end a mob boss does not want to own hundreds of kilos of gold he can only spend on illegal stuff. He wants clean currency or investments. Making the laundering much harder is one of the big reasons behind this.