Whether that warning is a good idea or not is irrelevant to asking why there aren't any innovative sideloaded apps on Android. In other words, the lack of side

Whether that warning is a good idea or not is irrelevant to asking why there aren't any innovative sideloaded apps on Android. In other words, the lack of sideloaded apps on Android is easily explained by the warnings and therefore isn't evidence that closed app stores aren't preventing innovation.