if they really do the job well and are in accordance with the plan and can be accepted by the crypto currency holders then they will be very developed like the FIAT currency bank. can even develop faster.
Job of making transactions right? But in crypto currency you can make it on your own and if you give control of your funds to someone then they will steal your money.There is no need for crypto banks because it is already in digital form so we no need a place to store it.