Do i need to select YES to unrestricted Web Access if i use a WKWebView that ONLY allows one website to be displayed to the user? I have set up that they can't browse another website than one I decided.
No, then you don't need to click this setting, I've created an app that can access all websites even http and I've selected this, the app got a high age rating but got approved.
Be sure that the user cannot hop from that one site to others like if it were a search engine.