Which smart devices were overhyped but failed to catch on?

I often see Meta, Snap, Google or Apple ramping up their efforts for smart glasses. But,... I have only seen 1 or 2 people in my area actually have them. I think it's more hype than real use (and maybe I'm just in a bubble).

What do you think was just an overpriced marketing gimmick and has no long-term perspective at all?

Here are some hints you can choose from, or come up with your own:
smart rings, AI wearables, robo cars, robots, smartwatches, AI/VR/AR glasses, smart home appliances,...