There should be a global minimum tax, but trying to make every single ruling party in the world agree to that is a fool's errand. I think that what the little that got leaked by the Panama's papers few years ago is just the tip of the iceberg.
We can do the same with billionaires and their assets.
The tax evasion industry (for corporations as well as for individuals) needs way more regulation and penalties. These firms inflict a net negative cost on society.
