自己交易赚不了呗，但是不能理解为什么有人跟，还有一开始是怎么做起来的…

The trader is making a profit, while the follower is indeed at a loss. I looked at the method; the opening and closing of positions is quite fast. It feels like they are taking liquidity? However, the scale of the following is relatively large, wouldn't taking the profit share be more profitable? I'm not quite understanding.