Maybe $7k will help these kids, but I doubt it, even if they receive the full amount. But Meta remains unaffected and free to continue harming other kids. That's the whole point of the complaints. Even if it were $7m or $700m per head, if Meta isn't harmed by the fine, it won't stop them harming more people now and in the future.
It's great that an incredibly small number of people might theoretically get some money that hypothetically will be used to help them, but I'm far more concerned about everyone meta is still harming