No logo in any city or town anywhere serves any governmental purpose. If that's the basis for the suit, it should be thrown out, with extreme prejudice. The blood-sucking attorneys who filed it should be disbarred and run out of town on rails.
"...to secure these rights, governments are instituted among men, deriving their just powers from the consent of the governed..."
Amendments IX and X to the U.S. Constitution are also relevant.