What apple store servers comes into the picture when I use my apps (uber, lyft, amazon, candycrush ..) on a daily basis?

I understand a one time fee ($99 or something) for hosting the app and allowing downloads, but why does Apple get an ongoing 30% cut?

Routing push notifications, telemetry, marketing and promotions, sales analytics, they handle all the internationalization of sales such as currency exchange and local sales laws. They also provide cloud storage for core dumps and other crash logs, persistent iCloud storage for user data, and remote build pipelines. That’s just off the top of my head.

And of course the absolutely massive SDK that makes it easy to build all these apps natively without rolling your own computer vision framework or audio processing engine.

So it's not Apples phone?