There is a huge difference in the amount of bandwidth that can be moved via satellite compared to undersea fiberoptic cable (not to mention differences in laten

There is a huge difference in the amount of bandwidth that can be moved via satellite compared to undersea fiberoptic cable (not to mention differences in latency). If all cables were cut and we went back to satellite we'd essentially be back to UUCP for worldwide datacomms for the general public. Speaking directly to communications satellites, they likely would not be immune to any conflict that affects underwater cables. US, Russia, and China all are rumored to have anti-satellite weapons and Russia has been steering satellites (spy or ASAT no one seems to know) around commercial telecom satellites