> Is the starlink constellation profitable on its on without any cross subsidization from any other Musk endeavor?

This is always a funny "gotcha" people bring up. Except the gotcha is always different somehow. Sometimes it's "the US subsidizes it" because NASA gets amazing deals on launches it would otherwise pay 10x or more for. Sometimes it's Starlink that subsidizes the launches. Sometimes it's the launches that subsidizes Starlink.

Maybe the answer is just what is obvious: vertical integration and economies of scale makes starlink/falcon 9 profitable. The combination is the thing.