Ima be blunt, based on the fact that loads of people are still without exchanging trade pairs because the likes of binance and such have decided to close deposits indefinitely (gcse computer science and business for us teaches how to develop disaster recovery regimes) so the fact that high profit exchanges can't do it is just off.
Most of these exchanges do stuff with customers money too while on there especially if they haven't withdrawn for a long time. Coinbase, poloniex, bitmex and binance I believe will all be susceptible to this, as well as bitfinex who have already proven how great their money management strategies are (I luckily only had a dollar on there at the time of that hack)...
Most of the exchange we have now especially the centralized one are not regulated and that is the reason why some owners of those exchange are temporary with fund from the investors and traders on their trading platforms. If regulation is there we would not have all those issues. For the op I think we are going to have some reliable and good exchange in future and because crypto market is at the beginning stages, we are seeing some problems with exchange platforms.