No, We can trust banks. Only point would be we need to accept their terms and conditions. Nowadays banks also have eased their norms and they have a changed a lot in their way of functioning. They are more customer focused now.
We don't have choice for now but to trust banks we can't fully utilized our bitcoin or our cryptos without them so we shoul still trust them and use their facilities even there are lots of procedure to go through.
I don't don't understand what exactly your point is, because trusting banks is not wrong for me since cashing out out btc to fiat can be affiliated through bank online. There's no problem with regards that kind of scenario, because banks is really trusted for a long period of time, and in fact there were many investors who showed up on their business many years ago.