With utmost respect, Mitch, that is not the complete story. In 90% of the cases, with store apps, when you click "install", the user will notice there is a warning that the procedure needs to use the internet. / "FaceGooThis App has permission to use your internet connection."
The reason for this is it then links to the original web site and downloads from there.
You can, alternatively, search, If you have some idea for what you are searching! with Google and get the same result.
Try this, if you doubt, for example, with FaceGoo. Find it in the store, or Google , FaceGoo App. You will get the same result.
The web site would be
https://www.facebook.com/FaceGooApp
As you can see, this one hides under the misrepresented secure prefix HTTPS.