In my estimation, it isn't the bank's fault but it is regulations from the government. For instance banks make a lot of money from foreign exchange, I think they are eager to go into crypto as well but government regulations are holding them back. In countries where there are no strict regulations, banks are able to get some revenue from crypto transactions.
Banks can never get in to crypto, they can invest into it by buy and hold it for long run. crypto and wallet has reduce bank opening of account, so many people no longer use bank for saving and transaction because of crypto. Banks keep deducting hidden chargers from saving in someone account, the arrival of crypto and wallet help people to save in their wallets without hidden charges, and one is in full control of the money in crypto, Banks closes on weekends and if one need emergency money you wont be able to get it, but in crypto one can sell and buy at any time.
Even if banks get involve in crypto many won't trust them with their crypto funds, so they should keep their business with fiats, crypto is not for banks to manage, every individual in crypto has a wallet to save their access, we need no body to save it for us. That was the reason why bitcoin was created to give everyone the ability to buy and sell their access at will without interference by government or banks.
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Banks can never get into crypto, they can invest into it by buy and hold it for long run. Crypto and wallet has reduce bank opening of account