Even when I have not known bitcoin yet I already know banks cannot give a good return for our deposits, they are the one who make the most of our money as they use it for their lending services and any other related money generating activities. That is our money but they are getting more return than us, therefore now I just limit my savings in banks and instead I put it in crypto.
When I was still studying, I already learned the lesson about how banks earn money and just like you said they lend our money to others and they are the one profiting from it. They give us an interest of 0.5% annually but let others borrow money from them 5% above annually. The recent issues in banks made me more convince that banks can't be trusted with our hard-earned money and we are lucky cause bitcoin exist wherein we have a choice now where to save it with an interest rate like no other.