I don't think that's a useful framing.

If not SpaceX, it would be all NASA. NASA lies about their budget all the time, with massive overruns. For example, the Artemis overrun exceeds the entire cost of Starship development so far [1].

[1] https://www.space.com/nasa-sls-megarocket-cost-delays-report

Not to mention that each Artemis launch is of the same order of magnitude cost as the entire Starship program. Each engine is about the same cost as Falcon 9 launch!