Why is there a light in the fridge but not in the freezer?

Cost of installing a light in both compartments which comes on when you open the door is the same. Benefit of having the light makes it easier for you to find things.

As people open the fridge more often than the freezer, benefit of having the light in the fridge is larger. To save Cost, light is only installed in the fridge compartment.

For the privileged few who may want light in the freezer compartment, some premium refrigerators now come with this feature at a premium cost.