Hard tech requires a lot of capital — money. He has the money. You and I don't have the money. So he won't find you or I competing with him. There's his moat.
If it just required clever use of AI to make a great company, that'd work. But you or I can also access the AI. And, just maybe, one of us finds a way to be a bit more clever than he is. Oops, there goes his moat...