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Skyhooks may not be possible anymore because of megaconstellations. Skyhooks could be built with current materials and they can lift payloads on a suborbital trajectory FOR FREE. For free being without propellants, electrodynamic tethers can boost their orbit by reacting against Earth's magnetic field. A skyhook might hit a musky pornosat every month*, making them uneconomical to operate and making it uneconomical to bootstrap further tethers.
*I pulled this number out of my ass, it might not really be a problem, but it's disturbing.