That argument doesn't hold for basically any industry on the planet. Early access often, by design, leads to lock-in in critical areas. SpaceX has a massive advantage (rightfully deserved) in an industry which takes massive effort to break into. It isn't hard for them to out compete any competitor into oblivion making it very hard for realistic alternatives to space. Do you know how much they took to orbit last year compared to everyone else? It is easily possible that it will be SpaceX and a few government providers and nobody else for a long while.
NASA and the federal government would trip all over themselves to hand a reasonable competitor huge amounts of money as a second source of launches. The fact that the second source doesn’t exist isn’t because SpaceX has some natural monopoly on space.
