I am in complete agreement with this. Just imagine what this forum would turn into if posters could just copy some text, and post it into a thread without understanding the thread or the posted text. It isn't difficult to post a link to an article, and add a personal comment to open up a discussion. In my opinion, failure to do this indicates volume spamming with no interest in the welfare of the forum.
It is one of the regrettable consequences of allowing sig spamming on the English boards, when the spammer has little or no understanding of English.
The unauthorised use of images is far more of a problem for content producers and users. The Internet is awash with images, and many of them are provided by their producers for use without restriction. For example, Jazz Pics - Kuffy's free image galleries contains pictures taken by me, and offered to posters and website developers with few restrictions. I just ask that the watermark is left on the image. I know that even this minor request is abused by many people. Google provides massive galleries of images, and the links are often to secondard user sites, and it can be almost imosible to track down the originator, especially if the EXIF data has been removed.