Anyway, how on Earth are these leveraged longs holding on for these periods of time while paying these sky-high interest rates? Especially considering interest rates for USD are at record lows in the real world ... It just makes zero chance. I would not be surprised if something shady is going on.
Just look at the charts - as long as there are swings like this, 0.2%/day interest is pocket change. Also consider that other exchanges charge more for a single trade (often from both sides), not just per day. If you trade one single time less you already have saved the swap fees...
But you can borrow USD way cheaper ...