The imbalance is that as platforms, newspapers cross-subsidize content. Interesting headlines attract readers to the newspaper, but once in hand readers are likely to continue reading the other, less unique articles. (See also why newspapers carry sports scores and comics). An investigative report is by itself a money-loser, but the overall effect on net readership is a win.
Aggregators break newspapers as platforms. Google et al provide extra discoverability for a single article, certainly, but then there's no lock-in to keep readers on the (now) website, reading more and seeing other ads. Headline-and-summary view might even result in zero-click satisfaction, denying the outlet even that first impression.
This might just be a change that the industry must adapt to, in the same way that television and radio news took over the news-breaking role. However, it is more than a trivial threat to the fundamental business model of a news outlet; it's not (just) superficial greed.