if i build a bank of bitcoin that operating like a traditional fiat money bank when people can save the money and get interest for their saving and also people can get a loan from my bank but the fiat money is change for bitcoin, the question is would you guys trust me to save your bitcoin on my bitcoin bank that i want to build ?
I think this makes no sense. Everyone who wants to save their bitcoins can use the bitcoin core. Why trust your bitcoins to an unknown bank? This is an additional unjustified risk.