There is now physical difference between a mixer and a exchange form network point of view.
making it imposible to see if bitcoin is traded or mixed.
But the customer access differs, a mixer usually doesn't require KYC/AML conformity from their customers. Hardly by coincidence, if one ponders their reason of existance.
Maybe we will see true off shore exchangers some day.
Well cryto 2 crypto exchanges do not require KYC.
from networ point of view you can not know witch adresses belong to what
espacialy change adresses created by the network to return btc back....
Well the feeling I get is that politics want something so "tech class" sell it to them , knowing what they want cant be done.
but they political class does not listen (or dont realey care) as long as it looks like it can be done its ok....