There are lots of laws in different European countries about when businesses can open on Sundays. They typically have religious origin (aiming for all people being sober and able to go to church on Sunday) but most of those countries are not so religious now yet some of the laws remain. Perhaps it’s just inertia, or some interest in the laws staying the same (eg in the U.K. small shops can open longer hours on a Sunday), or maybe in some places the people don’t want the laws to change.