Most of the exchanges are considered international and dance around laws and regulations. Some have versions of their site that are supposed to be dedicated to certain countries laws, but as we have seen lately that seems to be a lot of lies for a some of these exchanges as well. They make money on customer trades, but when the market is down, trade volume craters. If they were responsible with funds they would know this is coming and have planned accordingly, but most of these exchanges operate like its a perma-bull market. On top of all of that, they are leveraging heavily into other financial devices using customer funds on their books. Its a recipe for disaster.