It is maybe complicated, but Cloudbet scammed many people for enormous amounts. I would say: just pay this customer the last deposit back and case closed.
The fact that he made some other accounts is not good and complicated, but that is not a reason to confiscate the money. They can return it easily. I think that they are not even allowed to take it.
At this point I indeed would take a partial payment and I agree I did some stupid things. I appreciate the input. Thank you. I hope that cloudbet will respond again one day.