There is no maintenance, you have many cheap satellites - if one fails you just deorbit it.
How many is "many"?
One million.
You think I'm joking but I'm not. https://spacenews.com/spacex-files-plans-for-million-satelli...
How many is "many"?
One million.
You think I'm joking but I'm not. https://spacenews.com/spacex-files-plans-for-million-satelli...