What should the customer acquisition, marketplace, transaction, distribution, and experience support cost be for free apps? Something like 7 to 10% of what? T

What should the customer acquisition, marketplace, transaction, distribution, and experience support cost be for free apps? Something like 7 to 10% of what? The judge who ruled against Epic on the breach of contract wrote: ”There appears to be evidence that everyone that uses these kind of platforms to sell games is charging 30%. Whether Epic likes it, the industry and not just Apple seem to be charging that. Right now, Epic is paying Apple nothing. Epic itself charges third parties.”