I think there might be a point where recommendation algorithms kind of 'overfit'/become a filter bubble. I remember reading a article about the youtube recommendation algorithm led to increasingly more radical videos until you end up on 'that weird side' of youtube (https://www.nytimes.com/2018/03/10/opinion/sunday/youtube-po...). Depends entirely on what metric you are trying to opimize, I guess. With youtube is probably something like "time spent on the site". If you want non-sensational content instead you should probably read papers on arxiv or something.