Cash App complaint: Account closed and under review with no specific reason

My friend won a bet of $33000 and we both went halves on the bet so he owes me 16500 so he transferred the money from bank to cashapp because it wouldn’t let him send me my money through online banking because I live in England and he lives in California so then we had to wait 2 weeks for the money to go from bank to cashapp then he tried to send it to me through cashapp and buy 16500 worth of crypto and cashapp the instantly closed the account and keep telling him the account is under review but it has been over 1 week and they stopped responding to his emails and have only said under section 4 and 5 of cashapp terms the accounts been closed but no specific reason but I’m just worried that one of the cashapp employees have stolen the money and tried to say it was illegal money or something because things like this have happened to people in the past and my friend has given the bet receipt and all his proof of details but still he hasn’t got response about the money.