The tech industry used to think big. As early as 1977, when personal computers were expensive and impractical mystery boxes with no apparent utility or business prospects, the young Bill Gates and Paul Allen were already working toward a future in which we would see “a computer on every desk and in every home.” And in the late 1990s, when it was far from clear that they would ever make a penny from their unusual search engine, the audacious founders of Google were planning to organize every bit of data on the planet — and make it available to everyone, free.

These were dreams of vast breadth: The founders of Microsoft, Google, Facebook and many of the rest of today’s tech giants were not content to win over just some people to their future. They weren’t going after simply the rich, or Americans or Westerners. They planned to radically alter how the world did business so the impossible became a reality for everyone.

Whatever happened to the tech industry’s grand, democratic visions of the future?

We are once again living in a go-go time for tech, but there are few signs that the most consequential fruits of the boom have reached the masses. Instead, the boom is characterized by a rise in so-called on-demand services aimed at the wealthy and the young.

With a few taps on a phone, for a fee, today’s hottest start-ups will help people on the lowest rungs of the 1 percent live like their betters in the 0.1 percent. These services give the modestly wealthy a chance to enjoy the cooks, cleaners, drivers, personal assistants and all the other lavish appointments that have defined extravagant wealth. As one critic tweeted, San Francisco’s tech industry “is focused on solving one problem: What is my mother no longer doing for me?”