The only real beneficiaries of France's several attempts at a wealth tax have been Belgium and UK, where the rich French fled to. https://www.dailymail.co.uk/news/article-4932482/Wealth-tax-forces-12-000-millionaires-YEAR-France.html
UC Berkeley economist Gabriel Zucman, whose research helped put wealth inequality back on the American policy agenda, played a part in designing Warren's wealth tax. He says it was designed explicitly with European failures in mind.
He argues the Warren plan is "very different than any wealth tax that has existed anywhere in the world." Unlike in the European Union, it's impossible to freely move to another country or state to escape national taxes. Existing U.S. law also taxes citizens wherever they are, so even if they do sail to a tax haven in the Caribbean, they're still on the hook. On top of that, Warren's plan includes an "exit tax," which would confiscate 40 percent of all a person's wealth over $50 million if they renounce their citizenship.
Warren's tax is also only limited to the super rich, whereas in Europe the threshold was low enough to also hit the sort-of rich. This higher threshold helps it avoid problems like someone having a family business that makes them look rich on paper but, in fact, they're short on the cash needed to pay the tax. Also important, Zucman argues, the higher threshold means only a small group will be affected. And smaller groups have a harder time fighting for exemptions, which hurt European efforts. Some countries, for example, exempted artwork and antiques on the grounds they were hard to value. It's true, but it creates a huge loophole: Buy lots of art! Economists hate incentives like these because they distort markets. Warren's proposal calls for no exemptions.