The publisher can control how much content is exposed via RSS (typically just the lede), whereas with presenting scraped content by third party news aggregators, the user will never need to visit the origin site.
A paywall can. The page displays the snippet the publication is allowing to be shared, while the paywall hides the rest. I believe this is what a few of the bigger US newspapers are doing right now.
Ok, but that would require regular readers to have credentials for the paywall. I understood the discussion to be about scraping publicly accessible sites.
