Sure there are a few everywhere, but the big gaps are the issue.
For example in your screenshot if you zoom in on Poitiers you'll see there are none there, only in the two northern neighbor communes Neuville de Poitou and Jaunay-Clan. Similar for Nantes, none there, they are all in Saint-Sébastien-Sur-Loire and Thouaré-sur-Loire, the center and all the other suburbs have nothing.
