> using a DEX to trade from dirty coins into clean coins is cheap and simple Cheap, but not free. You're paying a premium. Which illustrates the article's poin

> using a DEX to trade from dirty coins into clean coins is cheap and simple Cheap, but not free. You're paying a premium. Which illustrates the article's point. As exchanges are reined in, and off-the-record bitcoin for cash trades are cracked down on (google "localbitcoin arrests" to get an idea - that should also answer your two other lines), this premium will grow, and it may well grow enough to make the whole thing impractical.