Of course Apple doesn't say that explicitly. That stance in implicit in Apples refusal to users to install without Apple's knowledge (i.e. use other app storea)

Of course Apple doesn't say that explicitly. That stance in implicit in Apples refusal to users to install without Apple's knowledge (i.e. use other app storea) and their many measure to force apple product users to pay for amy software features or services outside Apple's ecosystem.