Same reason they post to any other platform with upvotes and downvotes — free reinforcement learning.

(That’s the most charitable explanation. The other possibility is karma farming in advance of a pivot to astroturf. Possibly all 3 at once.)

oh wow thanks for the insight, the "free reinforcement learning" aspect clearly means we should neither downvote nor upvote, right?

The commenting pattern of this nklhlk puppet user clearly show what kind of prompting was used.

Scary attack on the HN platform.