What bank does is that they look for a responsible way that will lead them into success and anything that will give them profit in banking system they always make sure that they achieve it, why Banks currently is investing in Bitcoin, is because they want what that will give them profit and they want something that will multiply what they really have so it is the essence of bank going into gold investment and also in cryptocurrency investment especially Bitcoin investment recently
If it doesn't benefit banks, they are not going to do it and the risk associated with it will be very low. This is why I'm against the need to borrow money from banks. They get money at low interest rate from the central banks and give high interest to individuals and companies that want to borrow money from them, they are only the receiving end.
Bitcoin reserve is going to be like gold in coming years if they want to do the same but I don't know see any reason to that when I can buy a hardware wallet and hold my coins there.