In the terms and policies of some centralized exchange, they stated that they don't accept Bitcoins from an untrusted source such as mixers or a wallet that has been flagged, some exchange even stated that they don't accept Bitcoins from casinos.
That is why it is necessary to develop decentralized exchange platforms or use p2p.
So, if any customer disobeys those rules and send Bitcoin from the mixer or any sources that the exchange doesn't want, they will block the persons account and the customer could lose their coins forever.
Any third party to whom you transfer bitcoin is a source of threat and risk to your funds. Even if you follow all the rules.
The exchange are doing so to protect their image too based on the government policies, I guess.
Exchangers are controlled platforms for governments and therefore have a subordinate position.
So, when they cease those coins, how sure are we that they will take it to the government?
I doubt that this can be verified somehow. If the exchanger doesnt let government auditors into its "
inner kitchen", then the government will be able to estimate the real volume of blocked bitcoin?
Sometimes, after making such deposit, before the exchange detects it, you must have traded the Bitcoin to Fiat and withdraw it to your account, so what will the exchange do after you have already withdrawn the money to your account before they later found out that the coins was tainted?
What can the exchanger do? It will not have direct control over these coins. In theory, the exchanger can report that the coins are dirty to government agencies and report you (if you have been verified).
Another thing that just popped in my head now is, what if after you deposited the Bitcoin because you needed some money and wanted to convert the Bitcoin to Fiat, but you later changed your mind and you decided to withdraw back the money to a newly created address, will the casino report that your address to be flagged?
In theory, everything is possible, so try to interact less with exchangers if you are worried about such consequences. It is impossible to say for sure, because the exchanger's policy may differ.