Most likely explanation: Baader-Meinhof Phenomenon.
Slightly less likely: modern Haskell distills some ideas that have proven to be beneficial to software projects regardless of the language(s) they choose. As long as the number of HN users grows, and more and more of them realize the benefits of the FP paradigms championed by Haskell, there will be more upvotes for related submissions to the front page.
Slightly less likely: modern Haskell distills some ideas that have proven to be beneficial to software projects regardless of the language(s) they choose. As long as the number of HN users grows, and more and more of them realize the benefits of the FP paradigms championed by Haskell, there will be more upvotes for related submissions to the front page.