Réponse :
-Media in public places, so it's illegal. It is considered to be a degradation of state property.
-When there is too much of it, it makes the places disgusting which makes you not want to look.
-You impose your art in quotes on all passers-by when they don't necessarily like
(J'ai fini par te le faire xd, j'espère que je t'ai aidé ! :D)