Lots of products that should be made with butter are made with oil.

Alfredo sauces made with soybean oil instead of cream.

The products that have these substitutions will have a greater discount and more sales.

Frozen pizza makers slacking on cheese toppings.

Processed cheese.

And that’s just the industrial use side.

Probably best never to buy such products at all, and if you do, you probably aren't the sort that cares whether the fat is from butter or from canola.

Milk drinkers will just drink less when the price is higher (sometimes voluntarily, sometimes involuntarily).

Or do they buy them because they're cheaper than restaurant or take-out alternatives?

Or do they buy them because the packaging is appealing?

Regardless, processed food is generally shit, everywhere. Discerning health and quality conscious consumers in any nation aren't likely to favour purchasing processed food.