You’re missing the argument.
Right now I have confidence that anything that can run on my device is signed off and approved by Apple.
That gives me a sense of security and privacy. I don’t have to worry about something being approved or not approved. If there’s an app, I rely on Apple to have signed off on it.
That’s why I buy iPhone.
And all it really comes down to is that Apple has customers who repeatedly give them business each year simply because they like the app ecosystem not being a flea market where anything goes.