Aren't all billionaires conservative? I don't think about them for my own sanity's sake, but I cannot imagine a progressive billionaire.
Maybe there's at least one progressive billionaire. :
https://www.theguardian.com/news/2024/jan/23/austrian-heiress-marlene-engelhorn-who-is-giving-away-90-per-cent-of-her-wealth-im-creating-the-tax-i-would-want-to-pay
While we're at it, please sign the Tax The Rich petition for the EU :
https://www.tax-the-rich.eu/ Same petition but in Italian for Italians : https://tax-the-rich.it/
For US citizens : https://www.oxfamamerica.org/take-action/action-alert-tax-the-rich/
Edited the post and included two archive copies.