People with more resources have been exploiting people with less resources since probably the domestication of animals and plants created sedentary living and the idea of money/credit, perhaps before that even. Not just under capitalism, mind you, but every form of economic system.

I believe resource inequality will exist until free or near-free energy sources are developed, and even then, you still need ever expanding amounts of land/space. I believe it’s a consequence of scarcity and human nature.