Decentralised exchanges will always top these centralized exchnage due to high level of security Dex has over cex. If these exchanges upgraded their system to enable users have custody of their funds auxh hacks won't take effect on the exchanges.
Dex are good but the problem with them are the lacks of improvement. How many decentralized exchange were succesful on creating liquidity and volume you can nams only few. But centralized exchange has advantage over them since a lot of users like high volume on trading. But the sad fact remains that these cex has been not safe from breach. Even Binance has been hacked with lots of fund considering its one of the top most exchange.
With good regulate we definitely improve safe environment for users. Good example is Thailand as Thailand is one of the few countries to have adopted all the necessary crypto regulations in 2019, including issuing security tokens and trading with them, digital asset business license, license for Cryptocurrency Broker, License for Cryptocurrency Dealer, and Cryptocurrency Exchange license by the Thai ministry of finance. That is why Crypto Tron Exchange and Shop is also based in Thailand.