Are you aware of the vendor lock-in concept? Combine that with a duopoly and you get your answer about milking and Apple holding a gun to consumers heads.
It's almost a "natural" path for monopolistic companies. Once it got enough market share it starts milking it. Android(google play services) and IOS lock-in is the gun you keep asking for. The whole article is about Apple switching from major hardware upgrades/innovation to charging existing customers more for services.
One simple case is storage. Would would Apple provide you greater storage capacity when they can milk you more using a "cloud" subscription.
One simple case is storage. Would would Apple provide you greater storage capacity when they can milk you more using a "cloud" subscription.