And it's not even true that they just leave. First there could or should be an exit tax and second there is research that shows rich people leaving is not that common as to matter economically.
Cory Doctorow (npub1fdr…lvhs) recently wrote about a wealth tax in his blog: https://pluralistic.net/2025/06/23/billionaires-eh/#galen-weston-is-a-rat
#TaxTheRich