Bitfinex has not been playing fair and many of the practicrs the exchange has come across with should be considered unacceptable. Yet people turn a blind eye on what Bitfinex does because their is potential for profit. I really hope that SEC issues a warning against this particular exchange so US customers will have to be forced out of it. It'd be devastating for the exchange and we'd likely be saved from a ton of fraudulent trades instantaneously.
For the most part, they themselves have already forced most if not all of their US customer base out. No margin, no bank transfers for US traders, so it becomes pointless to use them now. I traded there since they were brand new and after the hack, everything changed, so I left.