it's not just the community, it's also you. easily observable if you acquire a new hobby and join the respective subreddits. at first everything is new and exciting, hard to understand, foreign lingo and full of cryptic references. you'll learn a ton of new things in a very short amount of time and soon start understand some of the lingo and those cryptic references, probably inside jokes, memes, abbreviations, known brands or names of people of note. after a while you'll find yourself in a position where you can answer questions of other newcomers - you've seen the same question several times and maybe asked it yourself at the beginning. you might become a productive member of that group, but at some point you'll see all too many patterns: the same questions asked, the same mistakes made, the same fallacies argued, the same arguments given for the hundredth time. interesting content gets rare - because the content you found exciting at the beginning now bores you to death. the jokes you found so funny when you heard them the first time get stale, the same meme is reposted again and again, the mysterious, edgy user going against the conventional wisdom turned out to be a troll. all the while a new user joins and experiences all the same excitement you did when you were new to the topic.