> I think banning is the wrong method, since it keeps the incentive to target teens: They are a very profitable consumer group. This does not fit my experience

> I think banning is the wrong method, since it keeps the incentive to target teens: They are a very profitable consumer group. This does not fit my experience: As a teenager (and as a university student), you barely have any money available. The value in targeting these users rather lies in forming their long-term values and long-time preferences (which rather few companies keep in mind: they are just looking for the next quarter). On the other hand, grown-up nerds who are intellectually under-stimulated or frustrated in their jobs are quite a profitable consumer group. :-)