That’s a tough question. While not a Luddite, I do think there are a number of technologies that are out of control, figuratively (or may – literally – become so.) But that doesn’t mean I think they should be gone altogether (it just makes me wishful that people can find a way to moderate their use.)

I’ll go with nuclear weapons, the one technology whose only use lies in not being used. I choose them because they result in low-level existential dread and inflated tax bills. [There is the argument that they may have staved off a colossal Third World War, but one can also argue that two really shitty wars in rapid succession led to institutions (e.g. UN agencies & permanent alliances) and approaches (e.g. low-intensity proxy wars) to avert such a war as well (Those things also being extremely expensive, but not so much with the existential dread.)]