Easy way for clean "dark" money , this is probably the classic "
Money Mule Scam" and this is gere you can see how he want to scam:
1) Scammer sent euro (probably stolen from neteller, paypal , bank transfer) to a 365Bet player
2) 365Bet player receive fund and play
3)Scammer ask for have back 40-50% (but probably more) of original fund, and he ask to have this trought bitcoin or other crypro
4) When police will go investigate will go to the 365Bet player because he is the only one that received fund from stolen account.