I'm new around the block so I wouldn't know much about the history of RR. But I think this is a good point.
Out of curiosity, I checked on the reviews of some of the top stories posted on that website, The Perfect Run, Mother of Learning etcetera. And the negative reviews on those stories are absolute nonsense, complete garbage with no real substance to it at all. One might wonder if these people have even read the story.
And based on some of the negative reviews that I've personally received there, it really does seem like there's a whole bunch of jealous a-holes running around with smurf accounts trying to bring down the competition just because they themselves were never good enough to achieve any sort of success. Or perhaps they were just warped from receiving a similar treatment in their work?
A lot of the .5 to 1 star reviews are just people cherry picking some minor, inane flaw a story has and magnifying it to make it seem like it's a bigger deal than it is. Oh? You have a female protagonist who had one empowering moment? Mary Sue! Everyone, we've got a Mary Sue here!
Not jealous.
Desperate.
Fresh stories get undeserved 0.5 too, they just die from it.
The visibility of your story on site is directly proportional to the rank you have, and rank is calculated based on ratings where only the perfect (5) matter and rest are damaging. Many stories are sunk, and subsequently soft-deleted (by being virtually invisible, almost as they never existed) simply because someone landed them a single .5 review.
Algorithm demands a constant endless grow, your story must constantly grow in followers, in rank, have a constant influx of positive (5-only) reviews in order to exist, while others must drop.
This creates a bucket of crabs situation where all writers are trying to pull everyone else down in order for their story to rise...
Or do it as a revenge for them never making it after their story was destroyed by the same nonsense reviews destroyed their stories. A single rating could destroy a story, regardless of its objective quality, given freely out of spite and maliciousness.
Since ratings could kill your story, there is a constant cycle of revenge, retaliation, trolling and organized campaigns to destroy other stories, making the entire site absurdly toxic. Others engage in "pain sharing" - I got hit, thus I hit everyone else.Rating wars if you like, which some could wage with bots.
It's very common for authors to hit the stories above in rating so their own could rise, because the spots on the top are limited.