Trusting anyone with your money is a bad idea, when you put your money in a bank you must never trust that it will be there you need to always be careful about what you do since banks can easily confiscate your money by just making a few clicks on a screen.
banks will only do that if you are doing an illegal transaction, if not, there is nothing to worry as all banks are govern with the law of the state and if they violate you can already file a complaint against them.
banks has been more established than bitcoin itself , hard to compare both actually. bitcoin just the next generation of money while banks aren't.
The word "never" I think is overrated. I agree with you @EdenHazard as long as you follow the law, nothing to worry. Also just deposit in your account an amount covered by insurance
whenever what happens you will be refunded.