You don't 'flash' a fake ios; you can use the bootrom exploit to put your modified version of ios into memory, and once you reboot you would get back straight stock ios. They could even make it reboot as soon as the password was harvested, leaving behind no trace. This is scary stuff. You can keep yourself safe by rebooting as soon as you get your phone back from border patrol, but many people would not know to do that.
Ownership is the state of exclusive rights and control over property, which I don't have when I buy an Apple device. Either they shouldn't say they're selling it (they can say they're leasing it to me) or they should give me all rights.
I like to think of “owning” in the developed world simply as a right to collect rent from someone else.
Are any of these restrictions there so a private third party can decide what you do with your property?
At least, that’s true in at least one state in the USA.
Also the developers and architectural controls can make decisions affecting what you build (down to the color you paint outside), before they turn things over to the city.
All subject to local laws of course, so may vary city to city.
I don't know what people aren't getting about this. You bought a computer that can only run code that Apple has explicitly approved. How is this ownership?