What I think odd on this case was activity of the OP balance history pattern. He keeps depositing that kind of all-in amount then withdraw once he got a small profit.
It looks quite like a gambling rage night.
Deposited 100k first, lost.
Deposited another 98k, lost.
Another 100k, lost.
Another 200k, won 500k.
Did the OP show his win/loss history here? only deposit/withdraw.
Is there a possibility that he wanted to mix tokens here using the casino? I see that he had a withdrawal on the same day so he would have deposited almost the same amount. I'm not sure what the wagering policy is at Duelbits, but it's understandable to me here if there is a concern for AML.