Not all advertising is tracking and clickbait, but in general it is still a cancer on the Internet, and on the modern society. The world is oversaturated with advertising, and we're all forced to look at it everywhere, day in, day out. Advertising is eating absurd amount of resources directly and indirectly (through support industries - from graphics design to printing, transportation and distribution), mostly to shift the split of a fixed pie of customers, in what's pretty much a fractal of zero sum games.