There have been some. When I see a post which resembles something I posted previously then I just drop my post with a link to my post in there. As long as they don't quote word for word my post, and as long as they drop a reference, I'm all for remixing and modification of posts. I just think people who do that should cite their sources like they are supposed to and I always go out of my way to cite my sources.
This way if my posts do get a lot of votes then they can look at my references and reward the posters who inspired my posts. Bots would have a very easy time looking for references and rewarding them if references were made into a machine readable metadata.