I don't know the right way to describe it but Apple is the gatekeeper to their customers. I think it's accurate to say they sell access to their customers.
I'n saying that from a chip supply perspective Apple is "monopsony-ish" since they control so much of the demand for chips. This is probably true in many areas of their supply chain.
The "smell" of a monopsony is the ability to squeeze suppliers to the point of having the power to drive them out of business if they don't meet your terms.
