Come to our country - have our police and courts and soldiers protect you wealth - all for free.
Oh - and because you are not paying tax - can I borrow some of that wealth please so I can pay for the stuff I'm providing for you free - I'll give you a healthy return.
The rich benefit the most from civilisation - and it costs - you can't just keep running from country to country hollowing it out for ever - eventually there will be nowhere left you can free ride.
Oh and in terms of the charts where you increase a particular tax and revenue goes up in the short term and down later - that's because people adapt - they find new ways to avoid tax ( yep including to pretend to have left the country ).
Just bwcause they run, that's not a reason to stop pursing them.