&gt; 2. there&#x27;s not enough money going through them to successfully launder a four-digit amount, let alone anything greater.)<p>Are you sure about that? I believe most of the onion drug markets have their own tumblers running in the background, so sending money to them and then withdrawing it should get you mixed funds. I&#x27;d expect the scale of business of those sites to result in quite a large mixing pot.