[kccqzy]

> As it is nearly every app that supports external links launches an internal webview in which they can track 100% of the activity (urls, net requests, login credentials, etc.

My understanding is that UIWebView (or WKWebView) allows the host app to do basically anything with the web view but since iOS 9 there's also SFSafariViewController that doesn't quite allow apps as much access. Many apps whose main purpose is not web browsing (like Twitter) use the latter.

> They could require apps that are not specifically a camera app or audio creation app not get access to the camera or mic and have to ask the OS take pictures/video and select pictures via the OS photos app.

This API (UIImagePickerController) also already exists since the very beginning but it is the app makers that think using a custom UI for photo taking or photo picking is more suitable. I personally refuse to grant apps access to my photo library except a small number of apps. (For apps like Messenger that could totally make do using the system-provided photo picker but does not, I initiate the sharing from Photos instead.)