Many empty orders are hedge funds, that is, spot suppliers. They are in stock and can deliver the goods after making warehouse receipts. As long as they have the spot, they don't need to close their positions and will eventually deliver them on the spot. And speculative empty orders eventually need to be closed for repurchase.

Hedging empty orders is often the main force to actively pull up. They sell the spot at a good price, close the position and raise the futures price, and continue to open positions at a higher position. For them, both futures and spot are profitable, and pulling up is to maximize benefits, because they are based on spot and are not afraid of short positions at all. Speculative short orders are often driven by rising prices, stop loss.