So if a restaurant rents a property to build a really nice looking outdoor dining area, do they have to surround it with walls so people arent convinced by it to dine there?

No. Why would they?

You understand there's a difference between a photo of a restaurant and a restaurant itself?

How edible does the paper, the photo is printed on, need to be to become acceptable advertising?

It's good that you think your clever. At least someone in the world does.

So if you accept GP's waiter's rosé suggestion, it was advertising, and if you don't it was not?

(Schrösédinger, if you will.)

No but your doctor would have to think twice about recommending this drug that he got to know about at the company sponsored golf trip.