Mirror trading is just copying someones trading strategy.
You can earn on the professionalism of the trader or lose some of the money
If a trader starts to make mistakes, his rating will begin to fall and his strategy will cease to be used.
But if a successful trader continues to trade profitably, he will also receive part of the profit from the followers of his trading strategy.
Therefore, traders will always have the motivation for successful trading. Then his profit will grow at the expense of his followers.