"A tiny Swiss bank .... The bank describes itself as an ethical organisation focused on backing firms investing in social and environmental projects." This is

"A tiny Swiss bank .... The bank describes itself as an ethical organisation focused on backing firms investing in social and environmental projects." This is the crux of the matter. Thier depositors are paying a mich higher fee by choice, in exchange for feeling good about their banking. I pay more for ethical food, clothes even childrens' toys to essentially make myself feel good/better about my spending. This bank can get away with it. Other can't (at least for individual rather than institutional depositors).