I don't know why someone will even take this kind of risk because it is very dangerous, how on earth will you even trade for someone as if you are very confidence to bring the return for him. The only thing I will advise someone is to trade with what he can afford to lose and also showing strategy on how the trading the works, beside that let him know that it is not guarantee that he will see profit or even see the money he use.
I just been fooled with what they normally see on social media, thinking that particular person just wake up one day and start seeing profit, trading is very risky which is why we have to be careful in getting involved in all this kind of mess, most of these guys are into gambling which is normally the reason why they want to make that money in trading also but it is not possible.
Some people are just too delusional. They might start trading themselves but with a small capital because they can't afford more, and they make some profits in the initial phase, possibly through beginner's luck, and then they become overconfident thinking that they can easily make a lot of money from this market if they have more money to begin with because they feel they have cracked the code. However, there is no code to be cracked, it's all about extensive knowledge and experience, if you have that, you might have a shot, but if you don't, you better not even try.
One should also think, if someone could make money from trading, enough money that they could keep some for themselves and also give you a part of the profits along with your initial capital, why would they do it for you and not for themselves? Even if one has a small amount, if they can make profits consistently, they can make it big eventually, but as you said, such people are not traders, they are gamblers, and they believe they have understood a certain pattern, which basically doesn't even exist.