Binance US has no liquidity because they are winding down operations due to all the US legal issues. Not sure why it occurred but for a few seconds Bitcoin spiked to 100k on the US exchange a couple months ago. There was only a million dollars of volume left on the entire exchange. Not sure who paid that price and why maybe they had some USD left on there and just converted to BTC at any price to get it off the exchange before it got shut down and their funds were frozen.