If so, McDonalds is abusing its power even more. They don’t even let me sell my burgers in their stores.

Similarly, it wouldn’t surprise me if music festivals or cinemas charge suppliers selling on their grounds more than 30% of revenues.

I know app stores feel different, but as far as I know, that legally still is a reasonably apt comparison. That may eventually change, but if so, someone will have to specify what exactly the difference is. I’m not sure that is as simple as “physical vs digital”.