There is no instant way to get money, if we are careful and wiser surely it will not happen to us because if you think about it, it is also strange when we give 3 ETH but they give back 5 ETH without doing anything. People should have realized that this is a scam.
maybe he is a beginner, he is tempted by the big results without researching it first, since a long time this kind of fraud has been circulating offering a lot of profit without doing anything, usually they send spam emails to people