Because of a tiny wealth tax that is already lower than in many other countries?

You think a relatively well off individual from a less wealthy country facing many systemic problems for business will pass up the opportunity to migrate to the US because they may need to pay a couple percent if they strike gold?

A founder whose only agenda is to get rich and then put the proceeds into a mega-yacht and private island or worse yet, lobbyists and political contributions aimed at protecting his own privileged tax status, is one I'd prefer remained a citizen of some country other than my own.

Then go. If the price of having them here is that they get to not pay their fair share while taking advantage of our infrastructure and workforce, they can pound sand.

They come to the US because it continues to be the largest free market in the world with a stable jurisdiction. That's the reason for the success of the American economy: Being the largest free-market economy with a stable jurisdiction for the past ca. 200 years. That's why entrepreneurs come to the US. Nothing to do with taxes.