One issue with sky hooks is that to keep them spinning, they need to accelerate and decelerate the same amount of mass; otherwise, they would change their velocity and might even slow down so much that they re-enter the atmosphere
Currently, with satellite constellations such as Starlink which have over 6000 satellites, the amount of mass being de-orbited and burnt in the atmosphere may actually have some serious impact on the ozone layer.
To help avoid substances such as aluminium oxide nanoparticle remaining in the atmosphere and causing ozone depletion, satellites need to stop burning up during reentry. The only way to achieve this is to lower the reentry speed enough so that satellites don’t burn up. Of course, this means that satellites would survive reentry, so there would have to be dedicated landing zones.
Using a skyhook, the second stage of a partially reusable rocket, such as the Falcon 9, wouldn’t be needed. Additionally, more satellites could be launched and de-orbited while requiring less energy since skyhooks are essentially orbital energy batteries. Given our current technological state, does it make sense to utilize a skyhook to de-orbit and launch satellites?