i don’t like to comment on things i don’t understand. in a live and let live sort of way. for me street art is a genre that is easy to understand by all, for the most part. opposed to abstract, contemporary and some other kinds of art. so your poem sounds uplifting and happy.
if “..for it’s free. No cost” refers to love than there is indeed a cost. a worthwhile one i’m sure. if it refers to street art, most is not free, piece to enjoy, yes. process, no.
if there is “no wrong” i’d argue there’s a lot of wrong. vandal graffiti rides with the destruction of neighborhoods. poorly planned street art is a mess. visual pollution is as serious and harmful as noise and other pollution.
all worthy concepts to explore and consider.