It's remarkable that, for a bunch of young people who don't know what they're doing, they've completely decimated any competitors - both public and private.
E.g. intern that knows nothing
From the perspective of a crusty old man anyway.
The Manhattan Project was made possible by similarly young grad students.
You can be as crusty as you like, but the reality is that young smart people can be extraordinarily effective under the right conditions.
As a customer of SpaceX, though, I have to say their customer service is barebones. It is almost a relief when I work with another launch provider since they provide a much better service and support. I always compare it to a low cost airline in my head, like flying Spirit instead of Emirates kind of thing.
It would be surprising if spacex wasn't just awful at paying things on time, as there's no reason they should have actual financial difficulties.
To say that China is "very effective at copying all the stuff SpaceX is doing" is quite the stretch.
(Counter point is that New Glenn's one orbital launch is more impressive than all of the Starship launches combined, as SpaceX is willing to burn hardware during tests and they have many more Starship tests to go).
In spite of all of this they are still a very distant 2nd place behind SpaceX. If anything ITAR hurts more than helps SpaceX since it means their talent pool is strictly limited to strictly domestic talent. They seriously have something "special" going on.
Artemis definitely isn't going to be putting anybody on the Moon. It again relies on the SLS which is just an endless money pit. But I do think it'll be interesting to see if SpaceX gets there before China. But I think the big picture is on Mars. I expect whoever gets their first will probably foretell who dominates space for the next century. Because once you can put men on Mars, the entire Solar System starts to viably become your playground.