There are many banks whose management system is very bad. Banks don't work properly so many people leave the bank and their existence goes down a lot. In that case, the bank incurs losses and the demand for crypto increases. In crypto, everyone can trade independently. Stocks are more likely to fail because they do not depend on the economy. In the case of banks, if the economy suffers, the rate of the bank decreases but there is no effect on crypto.
You mean the stock market will fall? No, it is also getting V shape recovery after the corona crash so no one actually is in loss except the salary class people who are the one ran out of money due to lockdown and big companies are still making the profits.Banks are always kind of bad with the middle class people and they will ask lot of documentation for the loan approval but we have no other choice than banks to get loans that is why they are going to survive even this corona crash.
Of course, government will not allow banks to bankrupt. They are going to survive in any way. Many people rely on banks and banks is the brain of fiat money that's why government will make sure it will survive. Also crypto is not yet accepted in most country or it was not totally use as payment method like fiat money.