The most significant breach is plagiarism, and this is the theft of other people's work.
Precisely. Plagiarism is a dangerous "mistake", but I also have a little doubt. Despite the fact of the act itself, meaning that any plagiarism is quite terrible, for you are stealing other's work, can the forum get into trouble for the plagiarized content in here? With the new EU policies about plagiarism as well as other further regulations, I don't know if this site can be even suited by posting plagiarized articles.