[nemo44x]

> Then the bank could make money by providing services to their customers.

The point of a bank is to loan money. That's it. This is how they make money. They need deposits so they can loan money. They pay the depositor a part of the interest on the loans they write. They don't exist to sell services because that's a really bad business. They provide services to attract deposits so they can write more loans. That's what banks are.

> ...and then invest that money trying to make a return on it.

No, they don't do that. They loan the money. If they can't loan it then they put it into a variety of safe places that can earn some interest, among other things. But they don't gamble depositors money. Investment banks may, but that's an entirely different thing.