Then reading between the lines, they flagged you for suspicious activity. This could be related to the outputs you sent. Is there any chance they could be associated with illicit activity, sent directly from a dark web marketplace or something?

Another possibility is your verification documents. Let's say hypothetically that two different accounts used your documents to verify, whether because someone stole your documents or vice versa. Binance would demand a video verification to determine who is truly associated with those documents.