As I mentioned; they lacked the scale and scope required to be successful.
In the 20+ years Google has dominated search, who has come along and iterated a “better” version? Bing? Is the capital and scope required not approachable, as you suggest?
Similarly, since Tesla helped demonstrate a valid market for electric cars, how many automakers have released competitive (and to some, better) EVs? If the capital requirements and scope were too large, where did Rivian and Polestar and numerous other upstarts come from?
I won’t disagree re: SpaceX.
I still think we should have just given it to NASA, a private entity has no business in space.