Robin Hanson thinks that strong cooperation within copy clans won't have a huge impact because there will still be a tradeoff between cooperation and specialization. But if the clan consists of copies of someone like John von Neumann, it can easily best world-class specialists in every field, just by forking a bunch of copies and having each copy take a few subjective months to read up on one field and do a bit of practicing. There is little need for such a clan to cooperate with outsiders (except maybe investors/donors for the initial capital) and I don't see what can prevent it from taking over the world as a singleton once it comes into existence.