So if all your money is tied up in your company you have to sell part of your business in order to be allowed to leave the country and by the way thanks for creating all those jobs? Sounds slightly CCP to me.
The US doesnt have an exit tax because, for the purpose of taxation, you can't leave.
In that they tax you when you stop being tax "resident", just like the others.
It's much simpler in many ways, although it creates its own issues with juggling tax treaties and realization timing.
Forcing you to pay a tax on unrealized gains is anathema to the US system, and would definitely burden founders to the extent they'd be well advised not to form in that jurisdiction in the first place.
One cause of China's real-estate bubble was too much (domestic) savings chasing too few investment vehicles.
To learn more, read up on financial repression in China.