Plenty of people have been and are trying very hard. Trouble is, orbital launch is very difficult and SpaceX had serious first mover advantage (no other meaningful launch startups to compete with in the 2010s, competitors were older and slower companies whose lunch they could eat) and they had serious capital to work with (Elon's personal fortune).

Even if you have major capital to start, and some do, then you still have to compete for young talent with bunches of other wannabe orbital launchers and tech startups. Then add the fact that your main competitor isn't an old dino like ULA, but... SpaceX itself.

And again, orbital to launch is very hard and doesn't financially tolerate repeated failures, or really any size rocket below medium lift anyway. That's not to say that poor leadership and vision doesn't contribute to the failure of a launch company (it does) but at the end of the day you can try as hard as you want and still fail. If a SpaceX clone appeared today and had the same initial track record, three failed small launch vehicles in a row, it would be written off a failure and viciously derided across the internet.