The platform must be of very high quality so that people start recommending it to their friends.
To recommend to your friends any platform or project is unfortunately the most ungrateful task. If you manage to earn good money, no one will even thank you, but if they lose their money, then you will be remembered for years.
It depends on person) but personally I am not a professional trader or investor so it is hard to be sure completely in any project. So thats why I would not advise