What bias? I’m questioning the author’s word choice and explained my reasoning for doing so. You have not.
“Shouldn’t such extraordinary amounts require equally extraordinary evidence of personal effort at earning them?”
Who are they supposed to prove it to? Who’s going to pay the cost of it? Why don’t you go first and provide a detailed account of your personal effort at earning your income? Be the change you want to see.
“If they really earned it, why do they need to hide so much of it in shell corporations and tax havens?”
So they can keep it probably. Best ask them.