Reminds me of something I experienced on HN and Reddit, though my case was a far less significant level. I posted a comment on HN in response to some article about Emacs. Later that day I saw someone had copied my comment word for word in reply to the same article on Reddit. I still have no idea why someone would do that. I thought at first it was some kind of karma farming operation but the post history of the Reddit user didn't really fit that profile. Plus,it seems like r/emacs would be a really poor choice for that. I've always been curious to know why someone would do something like this. It's interesting to read about it happening on a way larger scale.