Futures can be short, more orders can make money, and empty orders will lose money.
In addition, there is a deposit system. If there is leverage, for example, the margin is 10%, and the leverage is 10 times. If you do too much, the product will drop by 1%, then you will go through the warehouse and you won't get your money back. On the contrary, if you do it right, the money in the direct account will double.
The daily limit of futures is changing, not fixed. When there is a daily limit, it will increase incrementally, not fixed.