Setting aside the moral aspect which is highly subjective and seems to have a price tag (for example tech CEOs quit any sort of morals for a good paycheck), the productivity question is a measurable one.

Aka does advertising as a whole increase total consumption or is it a zero sum game (aka send bigger slice of the same pie to a competitor)

From what I know advertising does increase total demand aka more things/services need to be produced and sold on aggregate.