Correct me if i am wrong, but crypto casinos usually have pretty good revenue, and $4 millions shouldn't be hard for bigger ones like metawin, and they are even getting it back.
Here's their latest volume according to dappradar:

I mean metawin is giving away >$700,000 weekly with their race prizes! Why would anyone think that they wouldn't have buffer money for emergencies? Stake was just hacked for $41 million last year and they didn't even get it back. But it didn't even make a scratch to them, because their revenue is so huge. This isn't 2015, when something like this would have been the end. These days sites are able to absorb way more financial losses.
With the data you've shown, it's clear that Metawin wasn't heavily affected by the hack. With such a huge daily visitor count, they can easily convert that traffic into money. Honestly, $4 million could just be a week’s profit for them, so the loss is just a small hit. You’re right, Stake lost $41 million but kept going strong. When a casino gets hacked, it's really a test of how prepared they are in terms of liquidity. It shows whether they’re truly resilient.