I don;t think it's that big of a problem if it doesn't "portray a line from a song" or something like that. At least they get hung all over the city and tell people that there is a tiger army show on may 9.
as chloe said, he makes PROMO posters and isnt concerned with after show sales.
I still think is cooler than the normal, venue created, black and white flyer, picture of the band with some "edgy" font across the top on hot pink and orange paper.