The idea here is that it’s easy to find a safe, welcoming host nation with low taxes, and still be able to benefit from the functioning economies of the nations you left behind. However this is a pretty artificial system that only exists when there’s a lot of broadly-shared wealth and stability in the world. This kind of capital flight to the bottom is going to systematically undermine that stability. At the point where things start to seriously malfunction, nobody’s going to give a crap about a little bit of tax.