In practice, "Keine Werbung" means "No advertisements except for moving services". These are the only ones that don't give a shit.

In my experience, it's food delivery services.

I wonder if there is a way to make them give a shit. A pizza place in my area is a serial offender, and I'm wondering if an Abmahnung and the threat of a fine would get them to stop.

Outside Zürich, I see small-time car dealers, small-time precious metals dealers, delivered pizza and kebab from neighboring villages.

Perhaps advertisement is only something big companies do? /s