Binance DEX and IDEX are not entirely decentralized platform.
Cryptocurrency trading is the most popular investment method in the current market. There are many trading platforms for crypto trading. Such which centralized and decentralized trading platform can be more secure.
Worrying about the hack? both of them are prone to be attacked if they won't keep their security as tight as always. In the past, several hacks from cex and dex were made so both of it can be an apple to the eye of hackers if they won't maintain regular updates with their security. But as for Binance, I'm sure they've learned from the recent hack happened to them.