Random thoughts:

1. I was totally unaware of this, but if you search Google or Bing for "paraphrase tool" or "automatic paraphrasing", a ton of free tools come up. I'll bet these folks aren't even doing it manually. It might be interesting to track down the one he's using. I've been searching for about 1/2 hour and haven't found it yet, though.

2. The disagreement in the comments here over what qualifies as plagiarism is interesting (and surprising). I might have even given him a pass on "Sympathy with Sorrow... " vs. Adam Smith, if it weren't for the context of those other plagiarized articles.

3. It might be useful to set up a steemit account where people could reply to a weekly or daily post and vote on comments to indicate whether they think articles are plagiarized - as a sort of bounty system, then whales who want to protect the value of their steem could use that voting to guide vote-removal (or flagging) on plagiarized articles.