Which is basically how karma worked (oversimplified a bit). Whether lemmy does it or not does matter since its federated. Those who wanna karma farm are doing to go to the places that keep track of the karma equivalent, but they're going to post everywhere.
I used Reddit for years and never understood the points. Someone called me out once like I was lying when i asked what Reddit karma was. There's no monetary association, right? What's the value?