This is notorious in platforms like reddit, with people jumping in to suggest no name products in response to questions. It doesn't help that reddit allows private profiles, thus allowing astroturfers to get away with it. Also, another case is LLM astroturfing, we're bombarded with doomerism and obituaries about programming, some of said opinions are subtler, short comments, the most dangerous ones, because little by little they jab you, though the most conspicuous ones are easy to identify. And then there's the political astroturfing. In my country smokescreens are the defacto tool, but it is suspicious of the amount of high quality edits and memes that came out about the Epstein files, essentially cementing him as a "meme" and not a monster that abused minors.