Exchanges won't be able to meet "safe" standards from various people's perspectives. Especially about the dirty business scandals run by the founders that the average user can barely detect. In conclusion, there is no "safe" word when you entrust your funds to a third party
Also don't believe in naive author's article reviews (for example ^[1]), consider them a joke.

1. https://www.cryptovantage.com/best-crypto-exchanges/safest-cryptocurrency-exchanges/