It is against the law, I’m pretty sure. He does rent the bus stop and kiosk ones for his art. I shrug because the law is not enforced against graffiti “artists” anymore, if you look at L.A., sanfransicko, etc.
Remember recently, graffiti vandalism against posters of the loudmouth anti Trump woman soccer player ?? And reports came out of the new York police department that this crime would be investigated and prosecuted????
It depends what the graffiti is, and if it is targeting certain people for ridicule or criticism, as to whether it is considered an offense.