Like this site, one of the highest signal to noise ratios on the internet because no one has any incentive to game it.
There's tons of incentive to game it. If it wasn't, why would all kinds of startups and tech companies have alert bots and slack channels implemented to allow their employees to swoop in and participate in HN threads that are relevant to their marketing interests?
IIRC, the one's who've come clean about doing that have been fairly scrupulous about, but I'm sure they're just the tip of the iceberg.
Or a rigorous back and forth on the horse-riding tribes who spawned the Indo-European languages.
Or people can put in context some outlandish quantum computing headline in a way that you'd never get from the actual article.
That stuff is valuable.
A prime example of why gatekeeping is necessary and working.
I had a chat with a former politician and he was definitely pleasant, but extremely cynical, he pointed out instances of corruption everywhere. Although to be fair he was probably just being realistic not cynical. Cynicism is a good filter against dumb trends, hustler types and "emperor's clothes" situations.
If you want to find a platform with true signal to noise golden ratio, you either have to find one on the rise, NOT made by a well known name, and place a timer on it, or you have to find one people think is long dead.
lots of bots, and lots of spam, esp. in specific threads.