[have_faith]

Sideloading is not allowed per Apple rules and requires jailbreaking which comes with a list of caveats. So technically yes as a user I can side load but as a company providing apps it's not a realistic method of app delivery for the vast majority of use cases.

[austinheap]

Patently untrue. This is — at best — a decade old retort.

[FireBeyond]

Er, what? No.

According to you, I can jailbreak and sideload my iPhone 13? Or iOS 15?

Huh, doesn't appear so: https://www.getdroidtips.com/jailbreak-iphone-13-pro-max/