You see, that’s being said all the time as a counter-argument. But it has been proven to be untrue. First of all, there are exit taxes in most countries, the USA is pretty gung-ho on that for example. Also, the rich are also just people, that have families and friends. They won’t move just because they pay a bit more in taxes. People are lazy and like the environment they’re used to. Bonus if they have kids that don’t want to leave their friends behind. Lastly, where to move to? Many of the EU countries are the countries with the best living conditions world wide. Granted some of the criteria like accessibility and affordability don’t apply to the rich, but freedom of speech, general freedom, state of infrastructure, crime etc. mostly apply to them as well. And there are very few countries in the world that can match. Those that do are also expensive and or far away or have other issues.