Since there is permanent running inflation, it just needs time and 1 or 2 more financial crisis.

Hype. Any company that could approach a billion dollars run by one person could be disrupted by a company run by two people. Everyone would see this and try to compete with 5, 10, or 100 people.

If there was an exception it would be IP related. Maybe some game or whatever, but I think the company would have to look special and be more about the IP and less about being really great at writing agents.