I think there is no problem with the current top 10 exchanges and everything is going very well so attacks will be unlikely because security is always the top priority of all exchanges. If you are worried about losing money, it is best to keep in a cold wallet because this is a fairly safe way for all investors. In fact, I divide my capital very carefully and only spend 30% of my assets to invest in decentralized exchanges so I don't have to worry too much about investing.

Of course, hacker attacks are unpredictable so you should not keep all assets in an exchange because the risk can be very high and not recommended.