If I was American then I would immediately dump all my BNB and then withdraw funds to a different exchange which is more liberal. Kucoin is from Singapore or perhaps Huobi which is another good exchange and fairly liberal.
They'll all do the same in the end. It's just too much hassle dealing with Americans.
Anyway this presages a new US focused exchange for Binance customers but they had to partner with an American company to do it. I dunno if they can pool liquidity with the rest of Binance or not.