[thinkcontext]

The synergy of using AWS ground stations for customers as well as their own use is an interesting advantage. SpaceX has to spend on ground stations and won't make it up until their service goes online, while Amazon can begin recovering their costs right away. And it just plugs in to all their other AWS services as well. Plus Amazon of course has all the best on the ground network infrastructure already in place, SpaceX will have to develop that.

Is there any indication of how many customers they have or how much revenue they get from it?

[mcot2]

SpaceX has a tremendous first mover advantage and a ton more experience in Space. Networking talent and building things on earth is not hard to buy.

Starlink is ready to go now and already is in Beta. They have more customers signing up for the beta than they can handle and they can charge practically any price they want for this service since nothing else like it exists.

[thinkcontext]

Not sure what you have written has to do with what I said. I did not address the overall merits of Starlink vs Kuiper just the ground station aspect of the developing services.