The problem I see here is: what competition? There doesn't exactly seem to be any in the rocketry space. There's Boeing, but that place is a disaster right now. I guess ULA is still around, but they're not doing anything groundbreaking at all AFAICT, just using old rocket designs to launch some satellites. Where else can these people go?
Twitter people can go lots of places, both competing social networks, and also various other internet-related or software places. Tesla people can go to lots of different competing automakers. But I don't see anyplace nice for SpaceX people to go.
Plenty of of want-to-be competitors, but not so far with the amount of capital behind Musk. And space remains capital intensive, if not for hardware, then for people.
You say that, but at least half a dozen of these companies in the linked wikipedia list, all western, launched rockets last year. And several more are on track to launch within the next. Rocketlab is a serious competitor with multiple spaceports, a rapid launch cadence, and reusability and next-generation launcher projects in the works. Blue Origin is supplying engines to ULA and seems almost ready to test New Glen. Firefly had a successful launch. Stoke is working on a resuability concept that's even more exciting than starship, and advancing steadily through testing flight capable hardware. The list goes on.
Rocketlab and others even have products which standardize the bus part of the sattellite or probe, so you just attach your science experiment or sensor.
Twitter people can go lots of places, both competing social networks, and also various other internet-related or software places. Tesla people can go to lots of different competing automakers. But I don't see anyplace nice for SpaceX people to go.