It's had a problem for 10+ years. Not just astroturfing, but proper propaganda pushing on various topics & countries. It quite obvious as an 'outsider'. Then there is all the ai bots/posts that are being fine tuned by humans (deliberate incendiary posts, logical fallacies, which then get corrected by humans). Then the yearly cyclical repost of the same content and comments.. after a few years it become quite clear that certain content gets reposted over and over, by bots or staff. That is unusable.