there are thresholds of suspicion when coins are deposited, not all coins are treated the same and not all uses are treated the same
people shouting "fungible" have no clue how the real world works and just posture their own dream scenario as reality to make themselves feel better hoping that all coins are treated the same to argue that their dirty coins are fine.. when they are not
EG
if someone mined fresh coins and put them into a mixer because they were chinese and didnt want to have their income linked(not a crime in US) (think of any other non crime reason)
and someone from the US received those mined coins. which was only say 10% of their other stash not mixed. and their entire stash went to a exchange.. nothing bad would happen in regards to authorities seizing funds. you wont in some cases even get banned from using a cex in some cases*, because the threshold would be super low
however if you received coins via a mixer that was originally from someone related to a real crime (drugs, illicit porn, hacks, scams) and it was a significant chunk of your stash. your threshold would be higher and it would trigger an investigation which could, depending on the level lead to two options
A. the exchange stops offering you its internal services(placing market orders) and asks you to withdraw your coin and then ban you from using that service
B. says nothing but reports to regulators and regulators then respond with court order to seize funds and you find out via the authorities
option B is usually what happens after several deposits, whereby they all have the same high rating of illicit origin history, meaning its not just a random fluke that one time you had something related to criminal proceeds
..
*those people promoting mixers as harmless dont tell you that by using a mixer it does put a few ratings higher number on your deposits suspicious ratings
some exchanges just dont want any headache/workload of having to investigate or pay analyst services just for a mixing trigger so will just do an option A
I just want to point out that all that is correct. Including the second to last line, mostly.
There are risks with using mixers and other anonymity services, but that doesn't mean that you
shouldn't use them, especially if you have directly received suspicious coins from somebody else unknowingly. You (specifically) could say it is the lesser of two evils, with the alternative being, even though it is rare, to use coins tainted by government executive orders and that kind of stuff. Which have an even higher AML score than mixed coins and will almost certainly get you into big trouble.
