Orrrrr they didn't want to rely on/have to pay the exorbitant costs that 3rd-party (e.g. the incumbent studios) would be charging...?
I'd say Apple has changed to being a content company that just so happens to make actually good devices (as long as you don't fall into the "hurrrr apple bad!" trap).
Apple's been at it for ~5 years now re: Apple+ series, and they're not all must-see blockbusters, but getting better.