I am approaching app publishing with a new perspective! Once the app is approved by Apple and published on the App Store, I share the Xcode Project, free, with comprehensive Tutorials (and a Blog and Help) on my new website AppsGym.com
My 1st app to share is published as 8Books and the Xcode Project template is available on AppsGym.com. Totally free.
I also published 12 Medium articles based on the app, with complete Swift code, and you can find them at
https://mazenkilani.medium.com/
There is no money involved at any stage. I believe in sharing, and this is my small part in helping new developers fast track their learning paths.