There's been a load of kerfuffle about how Fortnite on Android saves APKs to external storage and how they can be overwritten before they are installed. (The press is awkwardly calling this a man-in-the-disk attack.)
I've heard from a couple of people that Amazon's Android app store also downloads APKs to external storage before installing them. Is it not vulnerable to the same attack?
Edit: To be clear I am talking about when you install the Amazon app store yourself on a normal Android device, not when it comes preloaded on a Kindle device. Obviously in that case they have complete control and can easily do things securely.