Whether it is a zero-sum game is not calculated according to the number of people, but according to the amount of money. Even if more people buy and fewer people sell, the number of multiple orders is definitely equal to the number of empty orders, because transactions are always one-to-one, which is different from stocks. Futures prices will rise, not because more orders are sold than empty orders, but because more orders with higher prices want to buy, but they may not be able to sell.