It seems like you don't understand the banking system so you say things like this without thinking that the bank always turns its money into other things through the customer money they have and when there are customers who withdraw large amounts of cash. The bank will definitely have difficulty in serving it for a full day because they have to take money from other places to cover it so everyone should think a little logically that the bank could go bankrupt if all their customers withdraw all the money they have saved in the same time The same.
If you don't believe what I'm saying, you can do your own research into what banks do with their customers' money. And I'm sure you will find the answer quite surprising because the bank also really wants to make a profit from the customer's money that they hold so I'm not surprised that when there are customers who withdraw large amounts of cash, the bank has a little difficulty in fulfilling it. Even though this can be handled, in that one day, it will definitely be a bit of a hassle to prepare the cash.
If he comes back to read this, he will now know it. Let's also hope that others will read this or do their research first about the banks so that they will know what to expect.
By there, it will now be up to them to take risks and consider the hassle in exchange for the safety of their money and earning some interest out of it or they will just keep it and invest on their own instead. Safety can still be attained if they will be very careful, vigilant and always does their research. I also prefer this because it gives me more freedom and profit, much more if I will convert my money into Bitcoin because it is decentralized and has a very limited supply.