if necessary, in extreme cases, we transfer all the information we have to law enforcement agencies.
When you list an exchange do you ask KYC from the exchange owner?
Under the current conditions, the tactic you’ve described, turns exchangers into bictoin-mixers, this is unacceptable.
What is acceptable then? Confiscate the coin?
The user said that it was from mixer. Using mixer does not mean it is black money. People use mixer to break connection of their coins, mostly when they do not want a trace back.