It is right that bank is secure for keeping your money safely, but it is just a security not a business. If you glad to get interest on your money form bank so it is so least than the outcome of your business whether you invested somewhere in business like investment in bitcoin or in something else. So the conclusion is to circulate the money and earn more money through money.
But other than gaining interests from bank, I am not finding any big advantages of using bank accounts to have our wealth with them. In this modern era, we are all thinking about having secured and fully privacy assure way of financial system so that we can safeguard ourselves from robber, for example. By considering these and all, I guess leaving off traditional banking system must be the right option for any person who are valuing their freedom the most than anything else.