They would give you an interest of about 1% annually and they would let your money be borrowed at a rate of around 6 or 7% and we are talking millions here so that's how they profit. They also use our money to trade and they got profit from it as well and invest in other investment vehicles as well. We should learn how to make use of our money without relying in banks.
What I hate about banks is that when my balance is below minimum, they would deduct my money so it would be much lesser until such time they would exhaust it as oppose to a crypto wallet wherein even just a small value is left, it would still be the same or the even good thing if its value grow after a few years.