When is forever? What you see is only a part of the position. The exchange only announces the top 20. In fact, futures are always long and short, just like 1: 1.

But the top 20 are all big positions. What you see is the positions after the closing, but you don't see a lot of big funds. The original intention of futures is to short and hedge risks. Hedging customers all hold short positions for a long time to hedge stock risks and adopt a neutral strategy.