[ABCLAW]

A number of the comments to your post have some vague sense of what's going on.

The key concept is that as you get more wealthy, you will have access to professionals and tax structures that allow you to defer and recharacterize significant portions of your revenue streams into tax advantaged forms. The exact mechanisms change depending on jurisdiction and asset mix.

Advisory services take money to purchase, but their cost, and the cost of various vehicles used to avoid taxes, do not scale linearly with the amount of wealth to shelter.

The panama and various other financial leak disclosure reporting provide a decently accessible area for lay-persons to investigate. If you'd like to see the effects of scale - there's a lot of literature regarding the multi-national corporation side of tax avoidance in academic journals that's easily found via google scholar or sci-hub.