On the same day this announcement made the news, they announced they would be opening a U.S.-based exchange. It likely does have something to do with financial regulations as the new exchange will be in partnership with an organization that is licensed with FinCen.

My bet is many of the U.S. users that are forced to leave Binance will end up with their U.S.-only exchange, though there will likely be some attrition and some users will end up elsewhere.