The number of subreddits that do this is small. Hardly representative of typical Reddit behavior.
Everyone knows by now that /r/conservative isn’t a real subreddit because it’s “flavored users only”.
However, too many people make the leap from “astroturfing exists” to “everything I don’t like is astroturfing” way too quickly. It’s right up there with accusing people you disagree with of using ChatGPT or being paid shills.
The truth is, a lot of subreddits are the way they are because that’s just what Reddit’s user base thinks, not because a shadowy cabal is making them say those things.
I read a post from a former reddit admin a while back that was talking about they managed that. Apparently they had one sticky post each day, and sticky posts are blocked from being on the frontpage but since they'd change the main post each day, once they un-stickied it, it'd immediately get picked up by the algorithm for the frontpage, inadvertently gaming the whole system.