"The Last Of Us" Stole This Guy's Art

What's up with all the "The Last of Us ripped me off" stories? First it was the actress saying they ripped off her likeness, now we have this story.
"Naughty Dog seems to have known that they couldn't use the official map without paying a hefty license fee," alleges Booth, "so it looks like they just went on the Internet and found another one. Cos, you know, images on the Internet are free for anyone to use, right? Not."