Apple is the kind of company that only uses you long enough to learn how your technology works and then once they devise a way to get around your patents, shut you out and replicate the functionality of your solution. Alternatively they just buy you. Like they did with Siri, TouchID and so on.
This is a vast oversimplification and twisted view of how this happened. Apple used this company's IP for 10 freaking years, think how long that is in this modern smartphone world. If you're a tech company and you're still making the same thing for 10 years without enough innovation that anyone can do the same thing in house with enough money, you should know this will happen. They were likely expecting they'd be bought.
As far as shutting them out and replicating.... Really? Replicating a GPU?
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Then, Samsung is made for Apple.
Samsung's IP is virtually nowhere in Apple devices. Their manufacturing certainly is, but they're mostly made to order parts with Apple's designs or someone else's. Samsung's great achievements are in manufacturing techniques, not the invention of the technologies they manufacture - which many Samsung fans think are Samsung inventions.
Anyway, if Apple bought Samsung, they'd be like a second arm for Foxconn.