A fridge that prevents food going off would be better, no? That wouldn't require smarts, just replacing the air with pure nitrogen, like modern grain silos do. Doing it at "consumer scale" would probably only require the same sort of compressor that your fridge already uses for its cooling.
There are some really low-tech things you can do to extend the life of things in the fridge. At least for vegetables, you can stick them in one of the fabric bags, add water, and they'll survive for weeks. And that costs just a few bucks.
For meat we've got freezers. Is ready food going spoiled a big issue?