yes, it is true. by only saving your money at the bank, wont make you rich. the interest usually lower than inflation rate
For sure it will not make you rich because if you will hold your money I bank then I am sure it will give you profit but very small as 20% after more than 10 year, it will only save your money but with high risk but if you will invest your money in bitcoin you will get rich faster because bitcoin use to increase in price thousands of dollars every months, so I prefer to put my money in bitcoin instead of holding it bank uselessly.