Storing bitcoins on centralized exchanges exposes us to many risks such as the exchange can freeze assets or go bankrupt...and compensation is very complicated or we even risk losing everything. Overall, there are a lot of risks that we will face if we store bitcoins on centralized platforms but that does not mean that storing bitcoins in personal, non-custodial wallets is completely safe.
I believe there are also hundreds of personal, non-custodial wallet hacks happening every year but most go unreported. Therefore, we should also be careful in protecting personal security when using non-custodial wallets, do not be subjective that we will be absolutely safe with it.