If Binance blocks access to US customers, where else can they trade ? As a European, I'm not familiar with American crypto exchanges. What are the most popular ?
Anyway, they can always use OKEx.
The US citizens can use gemini and coinbase. Both of them are located in the US.
The US has a strong dirty money/money laundering paranoia. Binance don't want to deal with endless demands coming from the authorities in the US. Many online casinos also follow the same idea.