all my portfolio is frozen by a cex,all i did was sell my nft

So yea i sold my MAYC to a guy who turns out was a sc#mmer. bimamce froze my entire 125k portoflio for this ...

How could i have known the guy had dirty funds ?

Full story here https://www.reddit.com/r/CryptoCexComplaints/comments/1bsg1fi/a_scammer_bought_my_nft_and_binance_froze_my/