Is the voting system not susceptible to meddling?
In the case of more low-key manipulation, on Hacker News in particular there's flagging which shuts down shenanigans more effectively if needed.
I don’t know if it’s happening, and don’t know if I would be enable to tell - by definition…
Additionally, posts that are incorrectly flagged can be vouched by another user (sometimes; the heuristics are unclear).