There would be no crowding out with a non-profit public banking and financial system….because everyone and every enterprise could borrow at 0%.

It is true that any unethical on its face predatory and/or destabilizing speculative purposes would not be funded by a system based on grace. Such speculative efforts on the system proper would be immediately declared “null and void”, and the compulsive gamblers and hard core pornographic enterprises would have to go to the remaining investment banks and pay interest on already saved money and profits in order to fund themselves. And of course any such investment enterprises will be closely scrutinized by the system as well.