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  • $\begingroup$ "a few minutes on their planet or structure around the black hole, while the rest of the galaxy lives a decade or a century" - sounds profoundly dangerous. Your enemies get to move thousands of times faster than you can. Or political events may spiral out of control before you even notice. (Of course, these very facts mark the owner's wealth, confidence and power - that he doesn't care.) $\endgroup$ Commented Jul 22, 2020 at 23:58