We can read on the top of the photo “affichage libre” which means “feel free to post”. Nowadays, in the city, it is forbidden to display some posters except on these boards. However, all the posters that are on this board have been ripped off, it is a big mess, and we can’t read anything. There’s quite a contradiction between the words “affichage libre” and the mess.
We suppose it means that whenever the city gives us some freedom or a right to do something, we waste it by destroying it.
It could also mean that when people have too much freedom, it always ends up with a mess. That’s why people need regulation and laws.