Of course, it’s easy to add an app to the home screen if the user changes their mind or accidentally removes the shortcut.
Perhaps this could be renamed to something platform agnostic? Or it could have a note added that indicates this image is used for other purposes?
It also has to be Chrome 51 or newer, right? I usually stick with Chrome Beta on mobile for day-to-day use. It could be a few months until the average person sees the banner on their device.