It's a cool idea, and might be great for a secondary fridge. For a primary fridge though, it's so much more convenient to have direct access to everything through a vertical door. I like energy efficiency, but I'm willing to pay 300kWh a year (around $40 here) for that convenience, let alone the space efficiency.
If you completely remodeled a kitchen around a chest fridge it might not be too terribly inconvenient. But the major blocker is that virtually every kitchen is designed with a perfect spot for a tall, relatively shallow fridge.
Cool idea indeed.
Most people in dense urban areas would actually pay less. By going vertical you’re freezing a whole m2 that was otherwise necessarily occupied by the fridge. In most places, 300 kWh is much cheaper than an extra irrevocable m2 for your fridge.
Plus, a horizontal fridge is just… convenient. You can’t even put things on top of a vertical fridge.