Tax advisers say non-doms are relocating to countries such as Portugal, St Kitts and Nevis, Spain, Greece, the United Arab Emirates and Italy, where taxes are either much lower or where they can pay a fixed annual fee to avoid them. Italy, for example, charges €200,000 a year to foreigners who wish to shelter their worldwide assets from local taxes.
I could have quoted every other paragraph, the article is worth reading. Citizens in ostensible democracies need to be pressuring their governments to close tax loopholes and to lean heavily on governments who allow physical relocation and account offshoring to evade taxes. There is no good reason billionaires and centmillionaires to exist.