> But those founders be content with merely making a hundred million?

What does this mean? Without some insane wealth tax this is literally impossible. No founder chooses to become a billionaire. They just keep growing a business that is solving a billion dollar problem.

The only other was is if after 100M they start turning down customers or restricting services.

This is conflating businesses that solve billion dollar problems with people who individually contribute so much to a business that they solved the billion dollar problem all on their own. The latter is probably possible, but it's not necessarily the case that all billionaires and up today were such individuals.

It might be that if personal wealth alone were (effectively, by taxation) capped to $100m, we would still have exactly as much collective wealth, innovation, and value creation as we do today. Possibly more, because of more wealth distributed onto shared infrastructure and into the fluid economy.

They can continue growing the business while giving other employees a larger share of the asset. One person doesn’t create a billion dollar company, dozens or thousands do. After founding, other people who don’t become billionaires work similarly hard and are similarly smart as the founder. This is why people dispute “earning” a billion dollars.