I’m sorry to tell you that an equivalent of Karma existed from the very beginning (though rather than being Upvotes minus Downvotes, it was Boosts minus Downvotes until a few days ago due to a bug). It’s called Reputation and you can see it by viewing someone’s profile in kbin. At the time of writing this, your Reputation points seem to be at 443. Reputation isn’t being used for anything though, and while it can technically be tracked by anyone, lemmy hides that information so far.
[In fact, you can see who gave up- or downvotes to something and you can also see what someone up- or downvoted (or boosted, but that’s a given, since boosting is equivalent to retweeting). This information is out there for anyone to access who spins up their own instance due to how federation works, so the developer of kbin decided to make it public so people are at least aware of this fact.]
They read 1984 and went “That sounds perfect! Now how do we get to that point asap?”