Copy trading works well in many cases if one can copy an expert. In the case of copy training, there are many people trading with very small amount of money at high leverage due to which their PNL is very large positive, seeing this, many people start copying their training with large funds, and then they liquidate their large funds.
I never advise anyone to copy trade and do not support copy-trading. It is always better to trade with your own knowledge and analysis, even if you lose, you can learn a lot and gain a lot of experience.