Really? Just because you have helped over a dozen people it means that this issue doesn't exist? Did you bother to check every local file on the person's drive that you were helping? If you didn't know about the potential issue how would you know to check. The author isn't saying its intentional hs's saying this is a side-effect of this model. Incidentally this is not the first type questionable practice from Apple Music. See this:

http://9to5mac.com/2015/07/02/apple-music-vs-itunes-match-dr...