Looks like there are ways to block sideloading of apps: https://www.brianmadden.com/opinion/How-do-you-block-sideloaded-app-installation-on-iOS-or-Android http

Looks like there are ways to block sideloading of apps: https://www.brianmadden.com/opinion/How-do-you-block-sideloaded-app-installation-on-iOS-or-Android https://www.brianmadden.com/opinion/How-do-you-block-sideloa... Basically you create an enterprise profile for your phone and block sideloading of apps as a policy ("Disallow_Install_Unknown_Sources). Same with iOS.