That is a stupid argument. I agree about the summary part, but paying even for just a link is idiotic. If someone asks me for the directions to a restaurant, I don’t have to pay the restaurant for giving directions to it. If they did ask for cash for this, I’d simply stop recommending the restaurant. I have no duty to them, and they have no right to me.
Facebook is doing the same thing. You want payment even if I only point people to you? Then I will simply stop pointing people to you. I owe you nothing. If I didn’t provide a summary but the people still don’t click through, then maybe your content is shit and people aren’t interested. Why should I have to pay to protect you from that?