PSA: Upvote is not an upvote like you are used to (like Reddit) - "Boost" is the Reddit Upvote
Like the title says, if you want to upvote something on KBin, you should use the Boost link, not the upvote button (Why? Don't know...)
The upvote button doesn't seem to do much, but Boost accomplishes what Reddit's upvote did. So if you're looking to encourage a post, use the Boost link.
Although the name "boost" is a little odd. kbin is more than than just a link aggregator. kbin is also a semi-blogging platform (View the microblog feed rather than threads) that interacts with Mastodon. If you boost something, it is the same as reblogging (re-tweeting) a post and generates a reblog post on Mastodon. The developer is going to change it to where the up and downvote impacts reputation rather than the current boost and downvote button. A technical oversight but they acknowledge this and plan on changing it in the future however internet points is not really a priority so no one knows when the change will roll out.
As I understand it, it’s a feature that is inherited from the underlying ActivityPub protocol which is designed to support all kinds of social network architectures.
If you use Mastodon, their usage makes a lot sense. A ‘favourite’ (upvote on Kbin) is a private thumbs-up to the poster - a pat on the back that has no algorithmic importance.
A Boost is more like a Retweet. Boosting something makes it show up in your followers’ timeline. I guess if you follow a person on kbin, Boosts will do that too and boosted stuff will show on your subscribed home page.