It's far from the 30% because there's nothing else for them to do other than keep that clear trail and it applies to every usage. Companies like Apple that char

It's far from the 30% because there's nothing else for them to do other than keep that clear trail and it applies to every usage. Companies like Apple that charge 30% charge that because they host the files, the updates, the payment systems, and review systems. Credit card companies don't do those things.