People consistently fail to properly assess the system architecture aspects of things. Iphone is not a standalone device but part of a complex system including hardware, software, organizational processes working on the app store etc. The device can be copied and improved upon with ease. The entire architecture of how these thousands of elements supporting the device fit together is much harder to copy. Consider Russia. They are, to an extent, capable of copying US technological devices from cruise missiles to aircraft. But they have, since 02.22, consistently failed to demonstrate their ability to make all the parts work together like the US has been able to. This despite US being their biggest strategic adversary and the considerable material and intellectual resources available.