If the aggregation site publishes enough of the news story within the aggregation site itself that the reader never follows the link the news site never gets a chance to show them ads.
This whole problem is rooted in the idea that the internet should be paid for by corporate propaganda, so I don’t shed a tear for anyone on either side of this.
Let me pay $5 a year for a login and give me an rss feed for your news network. I am now the customer and not a sack of attention that you’re using a minimum viable product to sell to your corporate owners. It’s a win win.
Try to get the c suite guys at a news Corp to admit reality is impossible tho.