Feudalism is a political system whereby land is granted to vassals on the conditional basis that they provide levy or taxes to their lord. While the system is notionally a reciprocal system (the fief is a conditional grant, both sides have obligations to each other), by comparing it with the dominant form of taxation that preceded and succeeded it--tax farming--it's fairly clear that the locus of power is decisively with the vassal here and not the liege. Whereas a state who engages in tax farming lets out a new contract every few years, and usually to the same people, a fief is an explicitly hereditary instrument that is abrogated by the liege only at great risk, since the power he has to enforce such a decision comes from his other vassals and his ability to personally persuade them of a course of action.

That is to say that the hallmark of a feudal society is one with very, very weak central authority and powerful local authorities, mediated by the personal interrelationships within and across different levels of authority. Apply that to your analysis of SpaceX and the mismatch is clear. In your analysis, SpaceX is an entity that is utterly dependent on the government for its existence, and need to invest a large amount of energy in acquiring the beneficence of said government. That's not the behavior associated with a feudal society but rather the absolutist monarchies that replaced them, pretty much the antithesis of a feudal society.