Except, of course, that there's no way to tell as an ordinary customer whether your bank is genuinely secure or just following cargo-cult security until they get hacked and lose all their money. There's also no way to make sure that your bank isn't using fractional reserve banking until there's a bank run and it fails.

And that's assuming people are rational and wise. They're not. For example since the Bitcoinia failure, the free market has lead to a whole bunch of Bitcoin users investing in something that has all the hallmarks of a ponzi scheme and accusing anyone who points this out of trolling and slandering the guy running it.