Apple apps are basically just a special folder that contain a combination of compiled files and uncompiled "resources" which can include images and even some of

Apple apps are basically just a special folder that contain a combination of compiled files and uncompiled "resources" which can include images and even some of the config files. You can easily browse any native app on a Mac by just ctrl+clicking it and selecting "show package contents" These cloners are just replacing image files and changing some text in config files which requires almost zero programming or reverse engineering skill.