Save money in banks won't make you rich, and inflation rate can make your interest rate from bank saving becomes negatively. In such cases, you lose more by making your bank saving, so investment will be your better choice.
True, 2-3 years in bank will obviously observe how the inflation rate will affect its balance. That's why businessmen don't want make their money sleep on their banks for longer time. They better to put it on some business ventures who needs it, or make their very own another business with some partners. Or invest it on stocks but some businessman prefer to hire a broker and make money for them instead of them. But smart businessman will do it for themselves. While investing in crypto is something they can but need a huge risks unless they are used to the violent volatile of the price lol.