These “smart” devices all fall under the umbrella of what the digital-studies scholar David Golumbia and I call “luxury surveillance”—that is, surveillance that people pay for and whose tracking, monitoring, and quantification features are understood by the user as benefits. These gadgets are analogous to the surveillance technologies deployed in Detroit and many other cities across the country in that they are best understood as mechanisms of control: They gather data, which are then used to affect behavior.