Bitfinex and Coinbase will be dropping ETH support (USA only) becaue Ethereum itself started as an ICO.

Americans got so rich off the first tech bubble (Apple, Google, Amazon, e-bay, etc), that they feel guilty and want the rest of the world to get rich off this new tech bubble.  

Americans are just trying to improve their image globally, and by allowing every other country in the world to get rich first, is a decent start.  Americans want it this way because they voted for it to be this way.  Thats why it is called freedom.