That's not what I mean. Take this example: Fanhouse is an app that sells a digital products created by end users and pays those creators for the content that end users subscribe to.

In terms of business relationship and product something like this can't exist on gaming platforms. Game platforms are strictly for publishers to sell their own gaming content.

iOS is a gateway to businesses selling both physical and digital wares of all types. By their good graces, they don't force physical items through their payment processor but they do for digital goods regardless of what that good is (with a few notable exceptions).