They want to deliver vast amounts of information over the internet. And again, the internet is not something you just dump something on. It’s not a truck.
It’s a series of tubes.
Later, because of their use by governments and large businesses, tubes began to symbolize bureaucracy. In George Orwell’s Nineteen Eighty-Four, pneumatic tubes in the Ministry of Truth deliver newspapers to Winston’s desk containing articles to be “rectified”. The movie Brazil, which has similar themes, also used tubes (as well as other anachronistic technology) to evoke the stagnation of bureaucracy.