title_body: Greek Coffee Law in Greece
upvoted_answer: I found this detailed article by an expert titled "how to make and drink Greek coffee" that seems to rather confirm your understanding of the matter:
  
  
    I remember when I was the Food and Beverage Director for Starbucks in Greece and we were launching the first store in Greece back in 2002, we had to serve Greek coffee in the store. Apparently there is a law in Greece that requires all coffee shops to serve Greek coffee (...) Α specific combination of beans is used to make this Greek blend, with specific bean varieties, roasted at specific temperatures and used in specific ratios.
  
  
  Source: How to Make and Drink Greek Coffee
  
  Author: Elena Paravantes
  
  I would interpret her statement to mean that Greek law requires all coffee shops to serve Greek coffee, but in addition thay can make and serve any other type of coffee.