Also... we are currently in a solar maximum (in the 11 year solar cycle), during which we get more 'space weather'
https://www.swpc.noaa.gov/
During a Coronal Mass Ejection event, the ionosphere becomes essentially opaque to radio waves, including the bands used by satellites, https://www.esa.int/Applicatio...
That means that ALL satellite communications fail. The SpaceX satellites fly quite low -- in the ionosphere in fact -- but all satellites are affected, even the ones way out in geosynchronous orbit, because the ionosphere is between the ground and them.
In other words, during a CME, all satellites are affected. Even the military hardened ones -- where hardening just means they don't burn out during a CME. Yes, you can still force some signal through, but not at the Gbps you get per wavelength in a cable.
Then there is a Carrington Event CME... which seems to occur very 100 years or so. The last one was in 1859...
This paper from 2021 looks at the challenges involved in using laser links to and between satellites. I think it's fair to say the technology isn't up to replacing the sub-sea fibre cables yet.