There is a shadow financial system that spans the globe, sure, everyone knows this at some level, its why we joke about off shore accounts, but why is the question they don't want to answer because the perspective is reflexively left wing. The awful truth is this is what allows us to indulge in the fiction of democracy as the flaw is once those who don't pay net taxes decide to tax those who do, it becomes theft and the productive either seek to escape or allowances are made to keep them as they hold up the system. This is why the narrative is a distortion, even in the UK, despite the claims of evasion, the rich still pay the vast majority of all taxes. The politicians and the elite juggle the laffer curve with the demands of the populous and the shadow financial network enables the lie.