Floodlight cam discount code but only for certain customers

I saw on FB where certain customers received a $200 one-time discount code for a Floodlight cam. Knocks that price from $249 to $49. I called Ring and they said it was legit but only for certain customers. How is that ok?? I hope someone from Ring reads this and can exlain how a discount is only good for certain customers and not everyone. Can you imagine going into Walmart or Target and radom discount cards being handed out? Or your utility company randomly selecting customers to get an 80% discount? I call foul!!