You have to pay a fee to keep your #money with banks.
You'd think it would stop there but they are extremely greedy.
The reality is that banks keep a fraction of the money you deposit on hand as they rely on the majority of people not withdrawing their money at the same time.
They will use the rest to try and make even more money. They will invest in different financial instruments, some more exotic and complex than others. Basically, they are risking your hard earned money to turn a profit
This is what we call fractional reserve banking.
Opt-out of this system and be your own bank. Choose #Bitcoin.