Although “smart contracts” represent an important move toward addressing the lack of chargebacks and refunds in cryptocurrencies, it remains to be seen whether they’re enough to solve the problem completely. Still, they’re at least partly responsible for Ethereum’s success.
U.S.-based users could continue to use the service by browsing the site with a VPN. Binance allows its users to sign up for a limited account without KYC — i.e. providing verification documents like a passport copy — which allows trading but limits withdrawals to two Bitcoin per day. That won’t satisfy more professional traders — most of whom you’d imagine would already have an account on Binance by now — but it does leave a loophole for others.

Although Binance.US is growing fast and is now considered to be one of the top exchanges in the United States, it doesn’t measure up to its parent company, Binance.
Some cryptocurrencies, like Bitcoin, have a finite number of coins that help to generate demand and reinforce their perceived worth. For example, the maximum supply of Bitcoin is capped at 21 million, as determined by the Bitcoin's creator(s).