The most interesting thing is that Banance is still not delist it, someone made a lot of money in the futures market with leverage.
I don't think that's something that appeal to everyone, because Binance could suddenly delete the token, although some people can still take advantage of this because it hasn't been deleted by Binance.
SUSHI probably entered into an agreement before the listing on Binance. Usually Binance charge a few million USD for listing a particular coin or token, and that too after careful screening. Perhaps the agreement between the SUSHI team and Binance requires the exchange to keep the token listed for a certain period of time. This is probably the reason why they haven't delisted the token yet.