Bank try for stopping how bitcoin and altcoin is drop and make investor keep hold their money in bank and keep away for holding in bitcoin or altcoin as their asset, we know why bank against for bitcoin and altcoin e currency.
I think the bank is only afraid when its customers leave the bank and choose to save money or assets in the form of cryptocurrency or digital currency so that when that happens the bank will go bankrupt and no one will use the bank to transact or save money.
The story you are imagining is really interesting but I do not believe that the bank is afraid of the appearance and development of crypto because the purpose of users for crypto is to invest and develop their assets, while the purpose of everyone for the bank is to store. Although crypto can still be a place to store but safety is too low, so there is no reason for banks to be scared when crypto and them are two different areas and have different advantages, Bank against crypto is just a rumor from many different sources of information, the fact that the bank does not have a strong or official action