Can you explain what makes Falcon9 / Starship special (or needed) to launch these satellites? China, India, EU, Japan etc. all have the capability to launch satellites. So why is a Falcon9 / Starship a particular requirement?
Has to be the cost. A reusable launch vehicle is such a ridiculously better value proposition that it creates a discrete evolution. Some things just arent feasible to do without them
Starlink is apparently 65% of all active satellites, it would be very expensive to emulate that without super efficient launching capabilities.
None of those countries (well probably except China) have any significant launch capacity to deploy constellations
Cost, maybe? It is one thing to ship up a valuable satellite (which they all can do). But to ship up 1000s of satellites (and keep doing it in perpetuity, because IIRC they don't have a long lifetime[0]) gets expensive.
0: Looks like 5 years. https://www.space.com/spacex-starlink-satellites.html