That is the fun stuff. They don’t. That is the lie.
If the USA and EU decides that the rich has the pay taxes then where do the rich go? They go to XYZ country, you might think but they don’t. Their business is in the US and the EU and their wealth is. They can slowly move their business and wealth… But they can’t move their market, which is where? USA and EU.
Also e.g. The old money in Germany will never leave Germany. Due to privacy laws and the safety that they live in, they remember the RAF and they are thankful for the privacy and safety.
It is a lie that they tell you. They don’t leave.
Edit: in case, someone is wondering what I think is a motivator for them. Comfort.