I believe they forced the implementation of this with some 'DEX' already and, if I remember correctly, that exchange received a lot of backlash. For mixers, this doesn't make sense at all. It would be similar to having multiple bank accounts to try and hide your wealth from the IRS.
Mixing is not a crime, and mixing your coins is also not a punishable offense by itself anywhere in this world. You can have one hundred bank accounts and one thousand cards, and nobody gives a damn as long as you play ball, I paid my taxes for last year and I did the papers for this one, you can't believe the garbage I had to write there since I withdraw a lot of dust back then from all exchanges to clean my accounts forever, nobody gave a damn. I had used 6 foreign cards in the past and because I have dual citizenship (both EU) I also have two bank accounts in two countries with the same bank

Nobody cares!
Problems arise when you get yourself needlessly in trouble with garbage deals, and this ruling won't save you one bit.