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The sharp decline in the quality of the posts in /hlgg/ can be attributed to significant decreases in the size of the community in terms of users and posts per month, so it's no surprise that the quality decreased too. A huge number of new users were attracted to /hlgg/, meaning that posts that had been performing well in the previous months had little room to grow.
I see a pattern emerging from the data that most blogs which I have analyzed use the word "hate" a lot, which ties back to the same idea that they might be producing less valuable content.