I don't think you understand how Binance which is a crypto exchange works exactly. When you buy or short some coin, you are not buying or selling from Binanace. Binance is only the exchange. You are buying and selling with other customers like yourself thru Binance. They are not trading against you, you are trading against the other customers.

The way you make or lose money is if somebody else is making or losing money. Its zero sum except for the fees which is what binance gets with every trade. For everytrade there is a buyer and a seller. Its an open market. There are some markets which can be very illiquid which might not even have a single bidder, because it means no other traders wants to take that position because they won't make money off it.