What do all the dots on this map mean?

What do all the dots on this map mean?

What do all the red, green and gray dots on this map represent?

Hint: Red means Broken, Green means Working, Gray means Inconclusive

Correct answer will be given in a few days, Friday.

Updates
3 mo
Each dot is a McDonald's fast food restaurant. Red indicates the ice cream machine is broken. Green indicates the ice cream machine is working.
What do all the dots on this map mean?
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