You can use kbin as a mastodon thing too, from what I can see, but I haven’t used it for that yet. I’d love it if I could attach my already existing Masto account to kbin, so that I could use kbin as the client for that account. But maybe that’s a silly idea.
I feel indeed that those two should be switched. It makes more sense to have the ‘favourites’ be boosts instead of the upvotes. I wonder what the downvote is mapped to :)