> does it have to be answered in general?

100% yes. Remember, this is somewhat adversarial: Meta increases its products addictiveness year by year. Banning individual practices fails if the rate of that growth exceeds the impact of point solutions.

> It's hard to answer in general, but does it have to be answered in general?

Maybe not? Maybe if enough minors experience harm from a platform, that's enough to restrict it for minors.