Because those type of crime considered as crime of moral turpitude and it's way easy to throw you under a bus than to have anything to do with you, probably mostly social aspect of it, and hight risk of repetition. Even with name cleared, it's easier to just avoid

Edit: Don't usually wrap other people into this type of issues. But look at case of Justin Roiland, he was only charged, not even pre-trial and everyone from job to friends turned back on him (I don't judge he might or might not be guilty). But once you publicly accused you are guilty even if you proven innocent

This was my question too. Pretty sure banks just never do background checks just to hold accounts.