Apple concept in light of fees?

Question

Apple

It is known that Apple takes 30% of the purchase of applications through the Apple Store.

But, for example, a free game with the ability to buy a "sword of omnipotence" for a dollar. From this they also get their 30%?

Answer 1

30% is taken not from the profit of the application, but from its sales in the market. If the application uses its own mechanisms to sell content, they (apple) should not take money.

Answer 2

Programs that pay for all the app store will not pass.
Payment can ONLY go through apple