I've read a little about the tax affairs of the mega rich, (I'm skint myself, as the Mrs and kids have bled my dry)
But if you read up on how billionairs trade NFA's and NFT's (non fungable assets/tokens) you'd see they live in a different world to the rest of us.
Also billionairs dont move cash around as you'd expect, they purely transfer ownership of shares, or ownership of commodities such as gold or diamonds, those gold bars and diamonds never leave the deposit boxes of the bank vaults in south Africa, it's just the percentage of ownership that changes.
And as they are off shore, and the asset is never liquidated, there's no tax to pay.
On top of that, the asset can be put into a trust, so it becomes the property of the trust, not the individual, and they can use the value of the trust to secure a personal loan, and that loan is then shown as a debt on their tax return, which is tax deductable!
That's explained very simplistically, but it's basically how the mega rich operate.
All governments know this, so when they say they are going to tax the rich more, they know it's not going to happen, but it's purely a way of satisfying the voters who will then vote for them, because they have no idea of what's really going on and continue to pay their 40% tax quietly like good boys and girls without rioting on the streets.
Look at it this way, I (like a lot of people now) pay 40% tax. Do you honestly think Elon Musk or Richard Branson or Alan Sugar, any other multi millionaire is paying 40% tax?
Of course they arnt, that's because they pay very clever financial experts to look after their wealth. And the more the tax rate increases, the more asset they move abroad.
And while it's true that the top 1% of earners pay 30% of the entire tax yield, they are only actually paying around 10% (for eg) of their income as tax.
Unfortunately the tax "loopholes" for the rich will never change, as it's the rich who fund the political parties and own our politicians.