Apple recently released a 'white paper' on their position regarding their tight control of iOS apps, which can be somewhat summarized in the following quote:

"Apple’s white paper proposes that, were iOS to allow the sideloading of apps, users’ iPhones would be subjected to a relentless onslaught of scams and security exploits, rendering all of their sensitive personal data subject to invasive collection from malicious actors. The paper suggests that a shadowy army of security exploiters and hackers is drooling over the opportunity to invade the 1 billion iPhones that are currently active, and all that is keeping them at bay, currently, is the App Store’s position as the sole legitimate distribution point for apps on iOS devices."

Should you have an interest in reading it, the following article from the TidBITS newsletter discusses this in some detail.

Jim Hamm

https://tidbits.com/2021/07/02/apple-justifies-ios-app-stores-tight-control-in-white-paper/