This incident shows that no exchange or wallet is safe from hackers. Second part is Kucoin managed it very well and the hacked hot wallets were redeployed. As per the update, cold wallets are safe and if any user is affected, Kucoin's insurance will get it covered. This is what expected from a good exchange.
Thats why I dont spend much money on any exchanges because I know they are vulnerable to the hackers, good thing they have supported funds for this and they are insured. The bit question here is, what if this happen to small exchanges which already happened and force the small exchanges to close their platform. Kucoin is one of the best cryptoexchange, someone is behind on this for sure.