In a surprising change, Amazon now sells movies in its Prime Video iOS app
Previously, you could watch on iPhones but had to buy the videos elsewhere.
arstechnica.com
iPhone and iPad users are now able to purchase and rent videos from Amazon directly in the Amazon Prime Video iOS and iPadOS apps in an apparent reversal of a longstanding limitation in Amazon's apps on those platforms.
Amazon Prime Video finally arrives on Apple TV, months after original announcement
Users discovered the changes in an Amazon Prime Video iOS app update—the app now displays a pop-up notifying users of the new functionality. Neither
Apple nor Amazon has made an announcement about the change elsewhere yet.
Historically, Amazon Prime Video and some other apps similar to it were limited to consumption of content acquired outside the app. So the previous version of the Prime Video app let users watch videos they'd purchased on say, Amazon's website, but it would not let them purchase those videos directly from the app. And in cases where app developers do offer in-app purchases, those purchases are generally made through Apple's own payment system.
More info from TechCrunch
Apple has an established program for premium subscription video entertainment providers to offer a variety of customer benefits—including integration with the Apple TV app, AirPlay 2 support, tvOS apps, universal search, Siri support and, where applicable, single or zero sign-on. On qualifying premium video entertainment apps such as Prime Video, Altice One and Canal+, customers have the option to buy or rent movies and TV shows using the payment method tied to their existing video subscription.
Very interesting. Maybe it's to protect from anti-trust heat? Also, there are also rumors of Siri integration with Spotify on iOS 14