Denmark has these machines also, but I believe the vast majority of the bottles are now crushed anyway, rather than reused. The traditional standard bottles, mostly nowadays used by lower-end beer and soda manufacturers, are reused (you can tell by the scuffing around the middle of the bottle on reused bottles). They're made of thicker glass and are in a standardized shape. But most beer comes in bottles with thinner glass and unstandardized shape. I believe that started due to the EU ruling that Denmark's requirement for standardized bottles was de-facto a trade barrier, since it made it difficult for non-Danish beer manufacturers to export to the Danish market.
