For publishers, @Flipboard's ActivityPub deal could let them take published content, flip it into Magazines, and then have it be pushed to their fediverse-supported apps.
I'd hope that Flipboard would have flip comments be the social post and the article be embedded link. And it'd be great if there was some tie-in back to Flipboard's Magazine to encourage growth. I guess @Techmeme's tweets pre-Elon is a great example.
And since Flipboard is pro-publisher, traffic goes to the news sites.