That has a simple answer: What banks / credit card companies take. Banks have to run infrastructure to transfer money and App Store have to run infrastructure f

That has a simple answer: What banks / credit card companies take. Banks have to run infrastructure to transfer money and App Store have to run infrastructure for certain services like distribution, quality filtering, etc. Why is it simple: Banks have settled this over (maybe) 100 years and have a (idealistically seen) competitive environment.