While I loved RSS and the ncurses readers it powered for me, the ad thing was real and many publishers just put a blurb or a headline on their feeds (basically worthless), content scraping requires effort and varies by site, whereas RSS / Atom would be standardized and stupid easy for any old talentless profiteering hack to install as a source for new WordPress articles to feed their content farm.
Having the "barrier" of writing a content scraper for each site you want to scrape and figuring out a way to get that onto your crappy WP link farm blog is a high enough bar that many marketers just can't be bothered, so it "solves" the scraping problem for the majority case at the expense of the users.
Now we have things like Feedly which AFAIK maintain their own scrapers and I can still basically read most articles without looking at ads for this one new trick to get rid of tonsillitis complete with a nasty gif.
Having the "barrier" of writing a content scraper for each site you want to scrape and figuring out a way to get that onto your crappy WP link farm blog is a high enough bar that many marketers just can't be bothered, so it "solves" the scraping problem for the majority case at the expense of the users.
Now we have things like Feedly which AFAIK maintain their own scrapers and I can still basically read most articles without looking at ads for this one new trick to get rid of tonsillitis complete with a nasty gif.