Banks don't offer to much as a saving vehicle in my country the interest rate is a joke and while you have savings protection there is a limit to how much money your bank covers if you have a lot of money you can lose it even if there is insurance of deposits.
Banks are trustable honestly, but we can never make sure they won't bankrupt at the end. Remember Lehman Brothers crysis and other main banking crysis took place in the previous years. Crypto is still huge!