But doesn't that just show a lack of undertstanding about what a non dom is? A non dom pays just as much tax on the income generated in the UK as a person domicilied in the UK does. The UK government just doesn't tax them on their assets held / income generated outside the UK, in exchange for an annual fee. And at one level, why should they pay tax in the UK? That income and those assets will be taxed in the country that the UK non dom is domiciled in for tax purposes.
Unless you are saying that, having already stripped out huge wealth from our ex-colonies, we should also then deprive them of tax revenue today as well ;)
In Mrs Sunak's case, the vast majority of the wealth was generated outside the UK, and is taxed outside the UK. Why is HMRC more deserving of that tax income than the Indian government, or if more tax is due becuase our tax rates are hgigher, on what basis is HMRC entited to it?
Back to the billionaire question, I don't think all billionires are the same. Look at Bill Gates, who has said he is giving away most of his wealth...which at one level is the US / tech version of all those Victorian philanthropists who spent their money on libraries, museums, housing etc for the masses. Is he a 'good' billionaire? But then what about Musk...?
I suspect that becoming a billionare, for most of them, is a side effect of them being exceptionally good at what they do. The question is, would they still do it if the return was less. Becuase if not, the world as a whole would be worse off