Ultra high taxes on unrealized gains. There are no taxes on unrealized gains presently, nor a wealth tax. Which is why if his wealth increases 2x, his taxation… just does not, unless Tesla pays him dividends or a salary.
If Elon had to live with a, say, 99% tax rate on anything above a billion dollars and it included his Tesla stock not just money he has for real, he’d be forced to sell, or go to jail for unpaid taxes.
Why 99% and not 100%? Just to mock them.