In the United States, the answer is because of ‘liability’ or lawyers.
The problem is that one or two people are going to take their glass coke bottles, and use them to store paint thinner, or something stupid and toxic. Then, those people will return the bottles decades later, they get refilled, and then they poison the people who end up drinking from those refilled bottles.
It costs more money to clean the incoming bottles in such a manner as to guarantee that they are safe, than it costs to make new bottles, so companies make new bottles instead of risking reusing a bottle that leads to a lawsuit.
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