Well, I guess so, but we are all here to share some information right? What if they layout the topic and make some summarize about it, should we still consider it as a plagiarism?
As long as people post things with their
own words, this forum is cool with that. This forum isn't going to insist on references for everything, like Wikipedia. Although providing links in your posts can make your post even better. This forum does discourage word spinning(changing the order of clauses, replacing a few words with synonyms and/or combining clauses of multiple sources) and can permaban someone for that. Usually the word spinners have just enough of the original text(s) to get caught.