Ok, step back from wikileaks for a second and assume that you were running a business, say, in the US. Your business is in the habit of doing something that pisses other people off, or not, doesn't matter. One day, you are unable to process any visa or mastercard purchases at all, and paypal won't give up your money. You have not been charged with any crime, you just are "opted-out" of the financial system by your bank. OK, you think, I'll just wander down the street to another bank and move your account over. No can do, they say. you're SOL.
Legal? Ethical? A bank should do two things. pay you interest on the money you deposit and charge you interest on the money you borrow.