Couple things you're not taking into account here.
A large amount of their money has always been collected in crypto. They likely had millions of $ of crytpo 5 years ago, which means they likely have billions worth now.
You are assuming that all their money is made through fee's, and although that is a very nice amount of money, I'm sure they were doing their own trading as well and probably making at least as much off of that as they were making in fees.
They might be saying very little about the situation for the same reason you should shut up if the cops ever start investigating you. Anything you say can and will be used against you. Maybe they're just a little smarter than you think they are.
People would be wary at first and would take most of their money out, but they just need to stay around, and people would come back in even greater numbers, guaranteed.
Again, I'm just being pragmatic. I'm not counting on getting my money back. I would be cool though.