Futures trading is a matchmaking system, that is, the exchange provides a platform to match buyers and sellers for trading, and the customer's counterparty is other customers, and the exchange charges a certain handling fee.
Spot trading is a market maker system, which means that there is a banker, and customers can only buy contracts from the banker and sell them to the banker. If the customer loses money, the banker will make money, and if the customer makes money, the banker will lose money, so in spot trading, the customer will eventually lose money.