I never paid much attention to it, but that style also pervades goodreads. But in that case, the style was there before LLMs. Many people seemed to think reviewing a book consists of writing a summary of the first chapters. It's the template you get taught for your first book reviews in secondary school, I guess, and it does work: such reviews (not only on goodreads) get upvoted. But why? Perhaps because it saves the upvoter the trouble of reading the book or article?
There's been a wave of AI(?) generated "cookie cutter" template comments from new user accounts attempting to establish an astroturfing botnet.
Once you 'see' the pattern it's hard to unsee it .. and they're now being rapidly flagged to death.
https://news.ycombinator.com/item?id=41024612