In my not so humble opinion, the only hivers/viewers/readers who would/should feel cheated and ashamed are just the chumps, naive, asskissers and blind autovoters who upvoted for such authors of paid/plagiarized content to the point of having taken their fake posts to the trending page. Well, I don't know, I just say. };)
I don't think you are correct. Do you check every post you read for plagiarism? Probably not.
I have no need whatsoever to check every post I read for plagiarism. Since I only vote what I actually read including each and every one of the comments in those posts. And therefore I would have realized instantly if such an author is or has been publishing plagiarized content for a long time and well in advance. };)
You hold the entirety of the internet in your knowledge base?
Nope, only in my good eidetic memory. :)