Watching how it is working. That the laundering can be tracked is just an expense to the process of recruiting suckers to be the visible parties who eventually do time and don't know about anything but the other visible parties.
If real money enabled laundering as seamlessly as fake e-money I would call for its abolition and a return to the carving of giant stone wheels as currency.
Any attempt to say they are on the same level is intellectual bankruptcy.
Like asking "What's the problem with restricting access to VX? Everyone's got a can of bug spray in their cabinet and they're both organophosphates, brah!"