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I could be wrong, but I would assume they're part of a bottle exchange; where they wash the bottles and reuse them
Can you name your country? Because, uh... No. If that actually exists where you live though, then that's awesome. We should have that here.
Pretty much every northern European country has had it since the 80s. Nowadays we melt it into new packaging though, supposedly it requires even less energy. And you get money for turning them in :)
Australia does it too.
We used to, here in Finland, but I think now they crush them and reform them into new bottles. The things cost 20c/piece, so everyone returns them.
Some dairy deliveries have that. We get milk, lemonade, creamer all delivered in glass quarts pints or half pints. Rinse and give it back the next week with the next delivery. I wish more grocery stores have this