It won't happen. people find a story they like, submit it, and move on. That's why so often the same story appears over and over and over again, each time say

It won't happen. people find a story they like, submit it, and move on. That's why so often the same story appears over and over and over again, each time saying effectively the same thing, each time from a different source, each one with nothing to add. Finding a good quality version of a story is hard, harder than checking if the same story is already submitted, and people certainly don't do that. So while it would be nice if people took that much care, they won't. Move on ...