1. Followers who join midway will immediately open positions to match the lead trader's positions, but the entry points will be different from the lead trader's, which may result in losses.

2. The exit position gives the lead trader an advantage over the followers, which may cause slippage and increase losses.

3. If a follower sees the lead trader resisting the position, they can actively stop-loss and close their position. If the market reverses at this time, it may lead to the lead trader making a profit while the follower incurs a loss.

4. The issue of margin size, in high minimum amount assets like BTC, the lead trader opens multiple positions to lower the average price, ultimately taking profit, but the follower may only open a few positions.