That would be horizontal integration. But that’s even a hard argument to make since Apple doesn’t have a monopoly or large market share of any of those segments

That would be horizontal integration. But that’s even a hard argument to make since Apple doesn’t have a monopoly or large market share of any of those segments — remember how Apple’s growth was supposed to slow down since their customer base has been saturated? Maybe luxury products but that’s a stretch. Apple isn’t vertically integrated since they outsource some of their manufacturing and assembly to other companies.