Surprised dedicated ultra low bandwidth satellites are the way to go when developing a service like this versus piggybacking on something like StarLink.
This was a separate company originally. In this case the RF protocol is completely different (~140MHz vs 12+GHz) as well so you'd have to add hardware to the StarLink satellite to support this (which obv. could be done moving forward)
No? SpaceX purchased it, so it's theirs now. They may for instance be using shared ground network hardware and software post acquisition. Do you have reason to think otherwise?