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So what we learn is that funds shouldn't be deposited to a centralised exchange directly from any third party. You should bring the funds into your non-custodial wallet first. Then you should use CEX to buy crypto coins and move them again to a non-custodial wallet. In the meantime, if the exchange is about the source of funds, you can show them with video proof, etc.
So just be careful.
this is very good advice, thank you for sharing. but indeed, centralized exchanges are increasingly unreasonable towards their users. if they find any suspicious transactions, whether from mixers or casinos, they will immediately freeze the user's account on the grounds that they are making illegal transactions. as users, this is clearly detrimental to us, because we know that we are not laundering money or doing any criminal activity. however, these centralized exchanges simply freeze accounts on the grounds of complying with regulations and in some cases they immediately terminate user accounts. and because of that, i have started to reduce my activities on centralized exchanges, because i understand that at any time they can freeze my funds.