Comments like this are a weird form of semantic catnip nerd sniping that unproductively derails the discussion. "We should ban tall buildings." "Oh yeah? Well define exactly how tall a tall building is." Clearly there's a thing as an ad, because it's a common word everyone understands. If your point is that it would be hard to pin down the part of that that's actionable, well of course. It's always hard to get regulations right.
It's important to practice like you play the game (we should debate the way we want the regulations to read, if we stand a chance of ever being represented).
