MobileCoin looks fantastic! Seems to solve the major pain points of Bitcoin: fast transactions, low transaction fees, private and no massive environmental impact with mining. Any ETA on when this will come to the USA?
MobileCoin isn't the only fast privacy coin in town - particl has most of the same features if not more, including a private ebay-style marketplace which should be ready for prime time in just over a month (all being well). And you can buy it on US exchanges today.