I haven't looked at the Amazon plans, but the risks of something like Kessler syndrome "trapping" us on earth from Starlink are low. The main reason is that th

I haven't looked at the Amazon plans, but the risks of something like Kessler syndrome "trapping" us on earth from Starlink are low. The main reason is that the Starlink satellites fly in a very low altitude, such that even if they lose all control, they will deorbit in a few years. Which means, if something went horrifically wrong, the Starlink system debris would clear itself within a short period of time. It looks like the Amazon Project Kuiper satellites will be slightly higher up, but still have a natural orbital decay time of between 5-7 years. https://spacenews.com/amazon-lays-out-constellation-service-goals-deployment-and-deorbit-plans-to-fcc/ https://spacenews.com/amazon-lays-out-constellation-service-... So, the long term risks from these kinds of low-orbit mega constellations is fairly low. If anything goes catastrophically wrong we wait a decade and it's gone. I think personally, the longer term risks we should be wary of are medium altitude and geostationary orbits that won't naturally clear themselves for decades or centuries if something goes wrong.