[r0ckarong]

Don't some of these have "smart" features to detect what is actually in your fridge and tell you if you run out? I would think removing the last piece of butter could trigger an ad for whatever cow-milk-fat substitute won the highest bid on the brainfuck raffle that day would be shown to you.

[abdullahkhalids]

Such a smart feature would most likely include reading labels, which means that the system would also know some of the medicines you consume. The fridge would most likely also record the user's interactions with the fridge, so the system will also know what your prescription amounts are. The possibilities of abuse are endless.

Another one: "you have consumed 20 units of alcohol this week, and run out. Should I order this 25 pack that is cheaper?"