I'm not sure. My guess is that the lauch site is not biggest entry barrier, I think that's more the development and construction of the rockets and stuff. And the biggest customers in the western worlds like the NASA and the US military have there own sites, I guess they allow SpaceX competitors to use them too.
Again, I'm no expert on that, so please feel free to add some expertise!
Again, I'm no expert on that, so please feel free to add some expertise!