Even that's fallen out of fashion again most places beyond the tech grift, but essentially there's only two extremes of ad copy for example these days. There's the wildly hyperbolic, cringe style of epic revolutionary jargon experiences. And then there's literally doing data input for software that completely stamps out any personality, imagery, or space for creativity. That's why so much web content writing is impenetrably boring, because the authors get little frowny faces from the software saying they can't post it because a sentence is more than 20 words long or they didn't repeatedly use the same six software pre-approved 'active verbs'.

As for the perhaps more actively damaging (as opposed to just making everything stupider or more bland) erosion of meaning in language I agree with you :100-com: although I'd leverage most of the blame there at so called journalism and news media than advertising per se. That being said, you could certainly make the case that news media in a capitalist system is simply advertising for the product of capital's ideology and opinion.