GM Used Graffiti in a Car Ad. Should the Artist Be Paid?

Graffiti created by Adrian Falkner, a Swiss graffiti artist known as Smash 137, in downtown Detroit, July 15, 2018. Falkner sued General Motors for using his graffiti as a backdrop a series of photos in an ad campaign without his knowledge or consent. (Brittany Greeson/The New York Times)