No Blood For Phlebotinium: Generally averted, since by the time a species makes it into space it has generally noticed that the universe is full of giant piles of natural resources, most of which don’t belong to anyone, and most of the really interesting kinds of phlebotinium are synthetic highly exotic materials anyway.

Of course, “generally” is not “universally”, and the odd war has been fought over exotic biologicals, rare gemstones, access to exotic stellar objects, and the like.  Very silly, really, or so the popular zeitgeist would say.