How do you know they don't? How can you show this? It's fine if it's just vibes but just want to know what is known and can be said.
I can't know for sure. For me, it's just the "eyeball method" of comparing HN and different subreddits on Reddit.
As to how I (or anyone) could show this, here are a few example questions:
1. How many examples of stealthy but otherwise blatant promotion do you see in the comments? Not every astroturfing campaign will be successful or original, so you'd be able to notice some patterns. Plus, HN is already commercially oriented, and there's the "Show HN" option, so it reduces the incentives for astroturfing.
2. Alternatively, how much controversy is there around the specific type of forum? For some subreddits, for example, you'd be able to see counter-subreddits popping up when participants feel the mods are abusing their power to promote one type of opinion.
3. Is a certain type of political/brand-related opinion or interpretation always at the top of your comment feed? For example, if upvotes determine the order of the comments, do you consistently see fewer critical comments on things that you'd expect the community to react to in different ways.
4. Do you consistently see some contributors having more power in discussions over others? Other than the mods, obviously. If this is the case, karma (i.e., number of upvotes) often has more value.
Still, I could be wrong.
The mods are active (and have even commented in this thread) and have a clearly stated set of objectives:
https://news.ycombinator.com/item?id=46309399
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...