Available for purchase... for now.
...and they integrated some of the Aperture to new Photos app, which is again was a transition to free.
Name me something a product, not a service which you can only subscribe in Apple's ecosystem.
The shows on Apple TV are only available via a subscription; there's no way to have a perpetual purchase (at least as far as that a la carte style of purchase is perpetual).
I used to buy the season passes so I could return to shows later; that's not an option for ATV stuff.