Well, I would add that both satellite and ground receiver have phased arrays antennae. These allow emitting multiple focused beams simultaneously. Since the an

Well, I would add that both satellite and ground receiver have phased arrays antennae. These allow emitting multiple focused beams simultaneously. Since the angular resolution of these beams is limited, they each cover a fixed ground area (let's say 20km across). If more than one customer sits in that area, they will have to share airtime with the others. Now, it's probably easier for the satellite to perform (time-division or other) multiplexing, since it knows how much data each node is going to receive. I guess it's a lot more involved when it comes to sharing upload bandwidth with another client you can't see. Anyway, this makes it easy to scale in rural areas, and pretty much a no-go for cities. Now, a question of my own: do SpaceX satellites already have HW for sat-to-sat communication?