I don't know why I decided to browse a popular sub today, r/books (logged out, I don't have an account anymore). Maybe I hoped I might learn something. As if! People make the absolute same posts over and over. Today I read a book! I read one page of Harry Potter and the Philosopher's Stone and I already know it's a masterpiece and the best book ever. I read 1984 and wow, just wow. I hate stickers in book covers. Audiobooks good. Actually audiobooks bad. I hate movie covers. The absolute same thing as yesterday, 6 months, 1 year, 2 years ago. May I remember this feeling next time I decide to browse Reddit again.
Why do old users put up with this? How can they even pretend that they haven't already read this stuff a million times before? Or are these subs 100% driven by new users and repost bots? The complete lack of new content is mind boggling.
You might be right. I myself have never really thought of sharing my impressions of the books I read, so can't really say what kinds of behaviour can be expected on such a sub.