In my perspective, copying an article as exact as what is being written is considered as plagiarism. Rephrasing some ideas on the original but the thoughts remain the same, plus, the there is no citation included is also considered as plagiarism. So if you are able to see those kind of posts not only on the bitcoin discussion but in the forum as a whole and you can justify your accusation by showing an evidence then do not hesitate to report it to the moderators. Or at least post on threads concerning about copy-paste posts here in Meta so that other members wipl be alarmed regarding this.
Such acts should not be tolerated because it contributes bad effects her inside our forum.