Pretty sure Apple's argument there would be that the "services rendered" includes continued maintenance and development of the iOS platform. That has been their

Pretty sure Apple's argument there would be that the "services rendered" includes continued maintenance and development of the iOS platform. That has been their angle with the EU DMA stuff, it's why their fee is called the "Core Technology Fee". (Of course, this is Apple's spin on it.) You could say that platform owners (over a certain size?) shouldn't be allowed to take a cut of commerce which happens on the platform. I certainly wouldn't be against that.