Money/cost of course.
Aesthetics.
Glass is heavy and fragile, metal and plastic are much less easy to break.
Plastic is often porous/permeable. Air can pass through (molecule by molecule) and change the quality of the contents. Glass and metal are more resistant.
Metal corrodes. tomato acid will eat a hole in the can.
So in practice it’s usually a combination. Plastic lined cans. Metal lined pouches, like juice boxes.
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