Starbucks Customer Draws Detailed Map of Middle-Earth on Coffee Cup

Someone on Reddit is claiming that a Starbucks customer drew this very detailed map of J. R. R. Tolkien's Middle-Earth on one of the store's cups. I'm not entirely convinced this is real, because it's almost too good. I've seen speculation that this might be some sort of sneaky promotional tactic for the company, but it's not like Starbucks needs any extra publicity - they're seemingly on every freaking corner - and it's not like the people who would appreciate this are stupid enough to go out and buy a cup of coffee from them just because they like a map that someone drew on one of their cups.

Anyway, if someone did actually take the time and effort to do this by hand, I supposed we should congratulate them because it looks pretty damn cool. But what are they going to do with it now?