Non mainstream media by its definition probably doesn't attract much people and damages would be restricted; I think the most damage happens in crowded echo chambers where a critical mass, assuming there is one, would be easily reached. Yes, very likely corporations would find other ways to exploit people addiction, and educating kids before it's too late is a good move, however I don't expect much cooperation by parents.
I meant parents who are among the grown ups I was referring to in my original post. Kids become addict to social media also because of their absence as parents, and giving bad example.