What is more unfair is that Apple forbids apps to open/link websites where subscriptions can be done to “workaround” the iTunes subscription. If you take Spotify for instance and login as free user, there are absolutely zero mentions that you can upgrade to premium, because they decided to lose those potential customers and rather let them know through other channels of their purchasing options (eg: emails).
On the other hand, this creates a very safe and simple environment for iPhone users. Absolutely NO app asks for a credit card, ever. You either pay one-click safely through iTunes, or nothing. There is no phishing, no mismanaged credit card handling, no credit cards “stolen by hackers from the app I installed into my iPhone”. I’m not saying this fully justifies the above unfair rule, but it’s at least a partial positive side effect.
Having recently jumped through the series of hoops necessary to cancel an NYTimes subscription, I am strongly biased towards App Store and Amazon-Prime-based subscriptions, even though they are arguably unfair to the providers.
Slight anecdote, because of that policy, Amazon doesn't support links to Amazon from Kindle Books. Which is fine 99.999% of the time. Until you buy a book about AWS and you can't click on any of the links to documentation on Amazon's websites....
However, Apple also wants a cut if I were to purchase a movie through the Amazon Video app. Amazon has disallowed such purchases for this reason. Instead, I have to go back to the web, make the purchase, and then I can view it with the app.
Some may argue that this is a fair price for having your app hosted on the app store. However, since Apple prevents any other means of me getting apps on my phone, I find it unfair rent-seeking.
Worse, Apple very clearly wants subscriptions to work just like in-app purchases.
Which is why the article emphasized Netflix trying to get customers to sign up through their web site, and not the app.