If that is the case then Metawin should covered base on their investigations, the money that the supposedly their customer loss from the hacks. But in this case, it's different, it's their wallet that was drain and not the casino itself that's why no customers are affected if I'm not mistaken.
The casino lost money, it's the same thing, if they lost 2 million or 10 million from their own funds or from customer funds it's the same from an accounting point of view because even if their customer funds are intact if they have no money for their operation they would have to close. If their customer's money were gone they could reimburse that from their own funds but were left with no money again
In short, it's a matter of left or right pocket, it doesn't matter from which the money was taken, it matters how much was stolen to what they have!