It's hard to answer in general, but does it have to be answered in general? I could imagine supporting a policy that infinite scroll in particular is addictive and app developers can't use it without strong warning labels and time alerts.
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.
Maybe not? Maybe if enough minors experience harm from a platform, that's enough to restrict it for minors.