Because it's just software. You can just change it and it costs nothing. Redesigning the powertrain in your car to be resilient when non-gasoline is introduced into the combustion chamber is expensive. Redesigning software is just changing some code; you just need to say something like 'Zoom. Enhance.' or 'It's a Unix system! I know this!' and it will take care of itself after a dozen rapid random keystrokes.