Rocket launch ex-Starlink is a small $N-billion market; a few dozen flights at $50M per flight. Starship is revolutionary and I can easily believe that it will expand the market by a remarkable order of magnitude. Multiple tens of billions. How does that justify a valuation over $1T?

Starlink Mobile is more significant, but it's still unlikely to double Starlink revenue -- most mobile traffic will always be transited by local cell phone towers.

P.S. I think somebody is going to make a lot of money from Starship. The money in space is not from launch but from the services it enables. Starlink >> Falcon9. But I don't think SpaceX is going to be the ones to find the next Starlink. It's much more likely to be a third party who launches on multiple providers to keep costs down.