A search engine cannot possibly remove every single piece of duplicate content, especially if it's just a few words or even a line or two long. This would be catastrophic! They need to focus their attention on people that blatantly copy entire sites, or at least large portions of them, rather than just a few phrases used as descriptions. I understand your feelings and I see why you're upset, but you need to acknowledge the fact that it isn't helping them in any way to have stolen these small pieces of your content. :)
That's why I mentionned that it is the task for the search engines to insure that their index stay clean and avoid billions duplicates.