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This is the worst thing I've seen from an exchange. First, they asked for information because the amount is more than $10k. Then they made up a story about tainted coins and some non-existent regulatory requirement for KYC and SoF. This is probably the peak, it is a competition from which they froze $11k.
They have made it so easy that they are freezing funds of their customers by giving such ridiculous reasons. Now the number of such exchanges is increasing at an alarming rate, we have seen many cases recently with the same pattern but their explanation is different.
This is a trend of harassing crypto users by trapping them in a web called KYC, they want all kinds of documents that make a crypto user's privacy disappear, which is really disappointing. They are again tagging that crypto user as an attacker even after holding back $11k of this user.