Your point about the traditional banking system is irrelevant since there's zero chance of successfully buying a kilo of coke with your Visa card. So whether i

Your point about the traditional banking system is irrelevant since there's zero chance of successfully buying a kilo of coke with your Visa card. So whether it's bricks of cash or shady darknet sites, the prohibition on drugs necessarily doesn't leave one with much recourse when transactions go wrong.