After a round of operations, the black money shrinks a bit (due to initial art purchase costs, taxes, advertising, and other expenses).
Yet amidst these middle steps, innocent people make a profit while paying taxes as required, making everything appear completely natural and a matter of course.
Boss Zhu, Hewell, and the money laundering syndicate lose a not-insignificant amount of money, but what they get in return is laundered cash.
Chapter 311