At least AOC is calling for a competing bank, and not killing off the existing banks.
As long as the taxpayers don't foot part of the bill. Been there, done that, don't have the T_shirt.
Your take seems to be that she wants a new Bank of The United States. That is annissue that can be discussed readonably. She seems to want to use the example of the Postal System. At least two problems...union labor and lack of any real accountability for screwwing up, and well the USPS isn’t really a part of govt anymore.