This is the correct answer. If the bits aren't coming from Apple's servers (so no 'it costs bandwidth and storage to store these apps) and if the payment isn't

This is the correct answer. If the bits aren't coming from Apple's servers (so no 'it costs bandwidth and storage to store these apps) and if the payment isn't being processed through Apple, they deserve no money from it - or a bare minimum for being allowed on the platform in the first place.