Saving money in a savings account is like putting money in a pocket with holes. Banks only give you interests that are lower than the inflation rate. Its how they make money. You are better off investing in ventures (Crypto currency) that give a return higher than the inflation rate.
You said it all yourself you said savings for banks and investment for cryptocurrencies right? Good. So why would be expecting to make profit through banks, its such a stupid thought
banks are not cheating you, they werent meant for investment, rather they were made for savings; you save money in bank and keep it safe and secured.
But as for cryptocurrencies youre investing your money with the purpose of making extra gains, and its not everyone that makes gain cause some people lose at the end.