Please don't get hung up on terminology - for the sake of conversation assume the name for the way the black box app gets information from the outside world is termed a "socket". It's a name, it doesn't really matter. What matters is you are taking information from the outside and giving it to the black box.
So say you give the black box in your sandbox a socket (from the above definition). Say it is a news app. This news app loads headlines and articles. How does your sandbox know if the headline/article text contains some form of encoding? How does it know the timing of requests isn't leaking information out about your viewing patterns?
