I've used in the past such exchanges to get rid of new coins or fork coins, for example. Getting to a "known" coin I could withdraw even 5-10$ like amounts was painful and I've been easily losing 10-30% on this kind of trades (or at least this is what I remember, I may be wrong, it was several years ago)
If we consider the exchange as a way to get rid of the next shitcoin, then this is clear and obvious. But I mean something else. People bring their bitcoins and other valuable cryptocurrencies to such exchanges and start trading there. What is the point when such exchanges have absolutely no advantage in trading such assets?
For a muli billion daily volume, a ~5 million hack shouldn't be a problem, but it might turn interesting if those were all the money the exchange had at that point.
Almost all exchanges provide fake trading volumes. In 2020, I somehow shared information in several posts on this topic, there was some kind of study that showed that almost all major exchanges are winding up volumes and these numbers are very far from real ones.