It was a great website. You could feel the fun of exploring everything together with hundreds of new users, from Lemmy communities to Mastodon toots with great threading of discussions. From custom magazine CSS to Collections (remade by PieFed as Feeds). A new, emergent website culture and the promise of later progress (we were meant later to have e.g. flairs (as Badges), and federation with Mobilizon).

You are seeing /kbin software as a Reddit alternative, but it could be more than that. I am aware of attempts of making, based on /kbin, a newsletter/blog platform (instead of Substack?) or a local social media website, as an alternative to Facebook local groups.

Mbin should still be able to view any post from subscribed blogs (be it from WriteFreely, WordPress, openwrite or Ghost), as a full article and the view of it should be very clean.

Did you mean Vivaldi? It features a sidebar already with their own Mastodon instance: Vivaldi Social featured as one of sidebar entries.

A Vivaldi account allows to use not only Vivaldi Social, but also to make a WordPress blog, with federation available too.