I see apple as like LVMH, but for phones. It has a minority of overall sales, but a majority of the “luxury” part of the market. This gives them influence over the whole market, but not a real monopoly.
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Tim Cook made it a juggernaut that holds more than half the market in many areas, can buyout whole supplies of a specific technology (e.g. TSMC and their 3nm process?), influences the relationships with a whole country (China) and has the size to weather most battles (e.g. the fight with the EU).