Glad Flipboard is expanding in the Fediverse, I’ve been following their various news accounts on Mastodon for a while now. It especially helps the fediverse feel more complete as a social media platform.
Sure, these don’t really matter for Lemmy and Kbin, but they are a huge deal for microblogging platforms like mastodon or misskey.
I don’t personally use Linkedin so I can’t really comment on how a federated alternative would work or be useful for professionals and networking.
What I will say is that paid/business-related and the general fediverse culture/design seems like oil and water. Especially the paid part. It simply won’t take off unless there is a mass exodus of people from Linkedin (very unlikely). And even then, having multiple instances for something as focused on Linkedin doesn’t seem viable. It’s probably better off centralized and disconnected from a large network like the Fediverse, in my opinion.
The closest the fediverse can get to this is professionals using Mastodon or something in the same way they used Twitter before it imploded. Interesting idea though.