It's not plagiarism, but it can usually be reported as low-content.
Thanks, I'll use this topic for further reference.
Another question:
Is it still possible to delete a locked thread, if the OP is this kind of low-content?
If not, it seems that one of the users who was doing this kind of spam has got wind of this reporting thing (realized that most of the spam topics has been deleted) and locked a spam topics after a few replies to protect the post count...