Main point is to do something to increase the cost of this kind of advertisement or decrease the effectiveness. Decreasing effectiveness is kinda hard, so for

Main point is to do something to increase the cost of this kind of advertisement or decrease the effectiveness. Decreasing effectiveness is kinda hard, so for short term putting on a trash can I guess, for the long run littering the street can be better option (can maybe push city to increase fines etc for this kind of advertisement)