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.
This is definitely a dent for a big site like Metawin, but it's a dent nevertheless. You are seriously underestimating how much of an impact these dents make. They will make several important changes to make sure that there are no more similar dents in the future.
Those changes are usually layoffs, security protocol changes etc which are done in the background basically.