i'mm a say this and leave it be in regards to bitcoin.....
this is a currency exchange system which is illegal in the eyes of government watch dogs. when btc hit it's record there were already court orders in motion hitting Coinbase to give up their clients so they can pursue them on tax evasion.
it's unregulated money laundering plain and simple. and these "exchange companies" will fold on your ass to save themselves. i'm not even saying it will happen in 2018, but that shit will backfire in the worst of ways.