This is my opinion.Banks won't make you rich.saving in bank can never do that,because of interest rate that bank gives you is too tiny.You saving will be simply be eaten up by the sleepy monster called inflation. As a example I will take ,When I'm in grade school,each day I received 10Rs (my country currency) from my mother.It was enough to by me 2 meals,but in now 10Rs enough to buy 2 candies. 
Banks are just for keep your money safe! 
The purpose of the banks are to keep safe all of our money. You will not earn big amount of money if you think that saving money from banks will give you profit. It is better if you will put on cryptocurrencies for you to easily double or even triple your money. Banks are just for keep your money safe! That is the purpose of Banks, why do we need to think that Banks will make us Rich since they are just existing for us to have a keeper of our money. I think banks are just putting some interests so that they can gather or make people put their money into their hands. And, crypto currencies is not the only way you can earn money, you can also invest on Real estate and metals that is a common asset for investors.