This isn't how it works. When customers pull their deposits out of their bank accounts, the bank can't turn that into loans, which is what drives a lot of the i

This isn't how it works. When customers pull their deposits out of their bank accounts, the bank can't turn that into loans, which is what drives a lot of the income. If the customers shift that money from the bank account into a trading account in a brokerage, they can't do the same thing with those funds that they do if it were in a savings account.