Also, think on the reverse situation. Apple currently makes 0$ on the sale of free apps but obviously these apps have a cost in storage and distribution. ¿What is the "fair" proposition in that case?
The fair thing is anything lower than what it is now. Distribution costs have dropped dramatically, and user trust has increased so accepting credit cards on your own really isn't as huge of a deal as it was ten years ago. Visibility is now zero from the App Store as well which was also a benefit back in the early days.
As an app developer, I can tell you that visibility is not zero. If you understand how the store works, there is still excellent money to be made there. The 30% cut isn't outrageous. You just can't be pushing shovelware.
That is 100% not true and probably right now Apple makes most of their App Store money from free apps.
98% of Google Play income is from free apps.
https://www.smartappmarketer.com/how-do-free-apps-make-money...
* An upgrade of some sort (often ad removal)
* In-game currency (which may or may not be a defacto requirement)
* A tip to the developer with no added functionality