Peanuts I say
All of these are small players when real money laundering is done in billions at a time and every globally major bank is participating, through other banks in tax havens. Malta is even famous of this: Estimated 90% of their monetary traffic is money laundering, hundreds of billions per year.
It is very profitable for bank and really big banks are basically outside of laws, they don't apply when you own president and half (all?) of the Congress.
Remember Goldman Sachs and 1 billion to Clinton? That was a payment for immunity, basically. That failed so they paid Trump too, no problem, and Trump named two G&S managers to his administation. Guarantees that G&S will never be prosecuted for money laundering.
And that's how you do it in large scale.
"South Korean police arresting a gang transferring $38m" ... a drop in an ocean and big players use their own bank/banking system, much easier that way and no questions asked.
Old meme of a criminal with suitcase full of cash is totally outdated, that's not the way it's done in civilized world. You put the money in your bank and the bank whitewashes it in two minutes with >90% return.
Of course keeping a bank costs money but you've plenty of money and once it rolls, it's very profitable compared to old methods.