The problem is not link aggregation, it’s the fact that most of those covered by it actively attempt to keep you from visiting the site. Google for instance, usually throws the main hook of articles into a summary, or moves you to an amp page which isn’t actually beneficial to the news site as they get no revenue for it. Similarly, Facebook is taking active steps to keep you on site and never visiting the news site in question.
So it’s not “just hosting a link” as you are putting it, it’s “hosting a link, while actively going to great lengths to never actually let the end user go to the site.”