The usual suspects: spam, advertising, that guy who had an LLM hallucinate a holy book, $X with "AI", but additionally there are certain sites that I automatically flag posts of. I don't auto-downvote political or economic comments unless they're low effort slogan level.
I think I should also add that I suspect that voting rings exist for HN. The mod(s) do a decent job of eliminating them, but I think there's pro-MAGA and anti-vaxx voting rings that have slipped through the nets.
