That may be the case for some large companies (though I'd still be skeptical of the extent of the beneficial effect), but at least in Apple's case, they have a

That may be the case for some large companies (though I'd still be skeptical of the extent of the beneficial effect), but at least in Apple's case, they have a long history of curbing this network effect by securing exclusivity of their supply chain. See e.g. https://news.ycombinator.com/item?id=3194836 https://news.ycombinator.com/item?id=3194836