With Apple being able to forbid application on the App Store and Google now requiring developer to identify themselves before compiling app, and being able to block sideloading at any time, I don’t see what choice is left if you want to bypass that privacy invasion.

I mean for the actual legit user. Pedophiles will still be able to use encrypted mail, Android phone that are not Google certified and so free to sideload anything, or even just passworded zip.