Comment by MBCook

iOS is based on MacOS is based on NeXT is a Unix.

It’s been designed with lower user trust since day one, unlike other OSes of the era (consumer Windows, Mac’s classic OS).

Just how much you can trust the user has changed overtime. And of course the device has picked up a lot of a lot of of capabilities and new threats such as always on networking in various forms and the fun of a post Spectre world.