Could Apple build this operating system just once, for this iPhone, and never use it again?
The digital world is very different from the physical world. In the physical world you can destroy something and it’s gone. But in the digital world, the technique, once created, could be used over and over again, on any number of devices.

Law enforcement agents around the country have already said they have hundreds of iPhones they want Apple to unlock if the FBI wins this case. In the physical world, it would be the equivalent of a master key, capable of opening hundreds of millions of locks. Of course, Apple would do our best to protect that key, but in a world where all of our data is under constant threat, it would be relentlessly attacked by hackers and cybercriminals. As recent attacks on the IRS systems and countless other data breaches have shown, no one is immune to cyberattacks.