Apple's report, "Building a Trusted Ecosystem for Millions of Apps -- A threat analysis of sideloading," stresses that supporting sideloading via direct downloads and third-party app stores would "cripple" the privacy and security protections of the iPhone, which would expose users to "serious security risks."
https://www.techspot.com/news/91759-apple-defends-not-allowing-apps-outside-app-store.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/91759-apple-defends-not-allowing-apps-outside-app-store.html?utm_source=dlvr.it&utm_medium=blogger