Brothers who often trade contracts may not realize that frequent trading fees can even exceed your principal, which is a significant cost.
Open the Binance APP--Funds--Contracts--Today's Profit and Loss--Funding Fees and Trading Fees, and you can see your fees for nearly the past year. For high-frequency contract traders and those with large positions, your fee expenditure exceeding the principal may only take a month.
So you must activate the rebate; the fees that should be refunded must be reclaimed. If you don't activate the rebate, all the fees go to the market. By activating the rebate, the fees will be returned to your own account, saving you at least hundreds or thousands of U in fees each month.
Spend what you need to, and save what you can.