This is the sort of thing that should / will be decided by courts, I think. We have many fuzzy laws where evaluating on a case-by-case basis makes more sense than deciding an arbitrary hard line. In this case, apps and platforms as a whole would be taken into account; infinite scroll alone might not be against this law, but if an app has a consistent pattern of addictive behavior and is harming its users because of it, something like infinite scroll might be forbidden for that app in a lawsuit.