Instead of using a DeLorean, you asked FSD to drive you to a future where all of Elon's promises come true. By what decade will starship have 100 ton proven payload, and be reusable without lots of expensive refurbishment?

One thing that isn't going to happen is to magically extend the life of low Earth orbit satellites. You can have low latency, which you need for a telephone network, or you can have long lived satellites. But not both. You also need propellant to avoid collisions.

$250k is plausible for a high capacity cell site for an urban area. A small site with wireless backhaul can be $10k, or even less in some cases. If I am to believe the optimistic numbers, a Starlink bird costs about $500K and putting it into orbit cost of another $500K per satellite. But that means be believing that SpaceX can launch a used F9 for just $15 million, when the retail price of an F9 is $75 million.

EBITDA is the wrong yardstick when you're talking about space rockets having to deliver your infrastructure.