Earlier quoted context omitted.
The 30% includes any kind of subscriptions or payment tied to the user account.
Seeing that most major subscription services on the App Store are already forcing users to subscribe outside of the App Store, Apple isn’t getting a cut of subscriptions from the most popular service. How many apps require a subscription and cannot be a web app because of limitations of Safari? How many paid apps would be websites if it weren’t for limitations of Safari?
There is a huge number of cordova apps out there. These are webapps inside a native wrapper, to access exactly those features that are crippled in safari. Reliable storage, push notifications, and not much more.