It’s a scam. You are required to pay Apple for a developer account. You are required to hand over 15%/30% of revenue for the lifetime of your app. You are bullied into paying Apple for App Store search ads or else someone else will take the number one spot even if the search query matches exactly your app name. Then you have to buy multiple generations of Apple hardware to test your app in different OS versions. And then Apple has the audacity to allow plain subscription scams in the App Store but bullies you in the app submission process for trivial things or rejects your app because the reviewer just didn’t read any provided instructions because they only have a few minutes per app review.