I've always thought it would be cool to have transparent doors so you could see inside without needing to open the doors. Obviously, most people do not have "neat" fridge interiors and would be considered ugly and not a good look. But having those cool spy room windows that go frosted or mirrored or some other opaque look with the flip of a switch could solve that. Which tech is less expensive: dimming glass or cameras and monitors?
Such refrigerators are available for commercial applications --- where the on-going energy usage is offset by the need for customer access, but it would be a huge impact on one's electric bill.
They're just less efficient and more likely to break. In a commercial environment that's worth it to show off the contents, but the trade off is different in a domestic setting.
This is common for useless products, like smart glasses or pendant-style AI devices. When consumers have clear utility, however, most give away privacy quite willingly.
Exhibits 1, 2, and 3; "Smart" phones, "Smart" watches, and pretty much 90% or so of "apps" people install on either from their respective "app stores".
E.g. when iOS introduced "ask apps to not track", 96% of users clicked "do not track": https://arstechnica.com/gadgets/2021/05/96-of-us-users-opt-o...
If consumers didn't care, companies wouldn't go to extreme lengths to hide the fact that they are tracking you, and to invent craxier and crazier dark patterns to trick you into giving up your data.
Especially these days when pretty nearly the entire advertising industry has a whole library of "dark patterns" and psychological trickery they've effectively outright "weaponized" against the "consumer class".