I'm sure you have a point here, but I have no clue what you're referring to. Reddit is indeed a very astroturfed place but you typically opt into it by joining a subreddit that actively caters to discussion of products or discussion of politics—not exactly what I would refer to as "subtle".

And if someone is using an LLM for either topic, my sympathy goes out the window. Same as with reddit. E.g. if you take the discourse on /r/worldnews seriously, you deserve to be propagandized.