The question is, is there any way for the user to tell the difference just by looking? Or is that something you have to be able to examine the binary to be able to determine?
On Android, when you have the WebView open, go to the app switcher and the title will tell you which app provides the view: the original app, or your browser.
They look significantly different on both platforms, so it's easy to notice if you know how ewch one looks
Yes, the one that is “clean” has the open in Safari icon. However, as soon as that becomes common knowledge I’m guessing the malicious apps will be adding that icon