SpaceX & Starlink are symbiotic, but do look like distinctly separate businesses. Each wouldn't want to be subject to major problems of the other: if one suffer

SpaceX & Starlink are symbiotic, but do look like distinctly separate businesses. Each wouldn't want to be subject to major problems of the other: if one suffers disasters, other isn't financially impacted. An "at cost" arrangement would greatly benefit both, former getting $ to cover launches (by which they can test & commoditize equipment/process), latter getting cheap transport.