I was reading over their Terms of Service and legalities, and it looks like they NEVER covered the possibility of being sued for their decision. So... That's on them to deal with. Most other exchanges explicitly state they serve the right to refuse any coin they desire. And depending on the exchange, the fee may or may not be refundable. In this case, they half-assed their TOS and are gonna pay heavily for it. You could say... Karma comes around to bite you in the ass