There's no way to verify centralized exchange! they're not open source, not giving your seed phrase, etc. If you use centralized exchange, it's mean you're trusting your money to them and you need to accept all the risk when the exchange bankrupt, confiscate your funds, terminate your account etc and you don't have any way to recover your coins. So it's mean there's no such safe in centralized exchange!
To be fair, when it comes to a centralized company or project run by one person or organization, there is no such thing as absolute safety. We accept their use means we accept the risk if something goes wrong. But currently for the market, we don't have too many choices, if we don't use them, there is almost no solution for us to choose. So always be ready to take risks and use them wisely to minimize the risk.