By Kevin Roose, a technology columnist and author of “Futureproof: 9 Rules for Humans in the Age of Automation.”

A few years ago, while on a work trip in Los Angeles, I hailed an Uber for a crosstown ride during rush hour. I knew it would be a long trip, and I steeled myself to fork over $60 or $70.

Instead, the app spit out a price that made my jaw drop: $16.

Experiences like these were common during the golden era of the Millennial Lifestyle Subsidy, which is what I . . .