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! 
Investing in the bank is very different with investing on bitcoin. When you are investing in the bank, there are some chances that your money won't grow that much since the growth there is very slow while when you are investing in bitcoin, there is a chance that your money will grow unexpectedly bigger than what you are expecting so choose investing on bitcoin rather than banks. Banks are just for keep your money safe!