https://thenextweb.com/basics/2020/06/08/cancel-subscriptions-purchased-on-iphone/

Apple offers you the ability to subscribe to multiple services through the App Store payment system, which is convenient. But suppose you want to cancel a subscription? Here’s how it works.

When HBO Max first launched, its payment options were very finicky. For some reason, the only payment option that would work was via the app — and since I have an iPhone as my primary device, that meant the payment was through Apple. Thing is, one of my roommates already has HBO Now, and was grandfathered into HBO Max at no extra charge. She offered to let me share, as there’s no point in having two HBO Max subscriptions in a single house, which makes sense to me.