Adding onto this, Apple is just one more production company in a competitive field. Either their original movies and shows will stand up on their own and find an audience, or they won't, and choosing not to produce adult-oriented shows/movies won't really affect the calculus too much.

Maybe they don't produce the next Game of Thrones, but maybe they make their own in-house Pixar, or maybe they could try to do either or both and still fail as a production company.