Is it illegal to instruct others to lose money in stock trading?

This is not illegal. Because everyone has judgment, you recommend it to him, and he can choose whether to buy it or not, and he is responsible for his own profits and losses.

Generally, I don't recommend stocks to my friends, because it is very likely that I won't even have friends in the future. The worst thing about this is that you want your friends to bear the losses, but you have to share the money you won. This is unfair. If you want to share the profits, you have to bear the losses. So you're not friends.