What does it matter if the rich and admired and powerful people are proven to be engaged in illegal tax schemes? Outside of their part missing from the tax total;
It lowers tax compliance. Voter confidence. Faith in law and order.
And all of those are in the recipe for a functional state.
These papers and any discussion thereof are quickly censored in China. The time before a topic or social media chat mentioning this is taken down is measured in minutes. It's only too bad it was a western leak so they can't officially investigate. Just too bad.
The Kremlin was fast say it was western propaganda and the 40 billion fortune in Putin's inner circle is in no way his to use upon whim. He's poor, really.
Where politicians could be cleared, their innocence was quickly announced in relevant media.
The Iceland prime minister resigned over this.
This is stuff that matters, but the full scale will come into view with later investigations of corruption and tax evasion. Just the size of this leak means it will take time. It's about ten times bigger than the Snowden documents that we're still getting revelations from.
And if you think this is in no way different from rumor, suspicion and the possibility of it being there, perhaps an example could illustrate this: The difference is like that of knowing that some people have a weird fetish of coming onto food and that of seeing video evidence of Herman coming into the pizza you eat.