If it were to be for the CEX alone, they would not bother since this is a business, they will just look away and continue to give you the best of services. But it is beyond that now and we should expect worse over time because regulators are now on their necks, CEX doesn't want to be painted black obviously with what m!xers are known for these days. Of course, they are in a better position to help the law enforcers more and they must continue to cooperate to avoid fines and keep their business running. Regardless, I believe you should have known better, no one should send their m!xed coin directly to the exchange, it risks banning and I expect this to be more strict with time.

Exchanges, on the other hand, could be overbearing at times, they might want to seize the coin and claim it for themselves, which might be the reason why they ban the account at times. I am just saying, it could be either of the two as I explained. The situation is not that bad if your money is clean, but I advise now that you should avoid dealing with anything linked to that address if they are centralised/custodial. You might open a fresh one for new transactions and if there is still money lurking somewhere in them, you might first want to use DEX to fix it and start afresh if you would use CEX again.