They didn’t have to pay to link — they had to pay to publish. As in, links are fine, adding a summary based on the content of that link is not.
That said, C18 was definitely a bad idea, and Meta spun it to their advantage.
Considering the undue influence Meta had over WHICH news people saw, I think Meta made the right choice.
And Twitter X - shame on them for requiring login to search for emergency hashtags. But nobody’s talking about that one.