It's a very large glass of wine, yes. That said, I've been in restaurants with large wine glasses that generously fill them.

I guess if you're paying by the bottle who cares. Ensures more consumption?

And, was more noting how people could deceive themselves. I just fetched one of the large wine glasses from the kitchen. Filled but well below the rim (maybe a couple of cm below) it was 2 cups of water (so 6 units!) - I emptied out the water and filled it with 1 cup of water (so well over the 2 units) the glass was less than half full. Visually looked about a third of the way up the glass due to the curve.