His income last year was around $60 billion, or $200 per person (of any age) in the United States. While last year was exceptional, all of his wealth ($600 per capita) was income in the last 20 or so years, most of it in the last 10. And his ex-wife Mackenzie Scott kept 25% of their combined wealth when they separated.
So it's simply not true that his contribution to GDP looks completely trivial even when compared to total US GDP.
Secondarily, capital gains is not really the same thing as income (at least, not in the tax code, and also not in GDP calculations), and most of his $60B "income" is increases in Amazon stock price. And even if it were actual cash income, the GDP difference between the US and Europe is still fifty times larger than that.
Look: I was an American by birth, but I moved to Europe as an adult. I get the attraction, and I'm not trying to bag on Europe. But it's simply false to suggest that America is not overall richer than Europe, or to say that America's extra riches are all concentrated at the top.
The GDP difference between the US and Europe is fifty times larger than one rich person's own income? This isn't actually a great argument dismissing the suggestion that US wealth is extremely concentrated.
Are you really counting the increase of Amazon stock price as his personal income? This is totally inaccurate. Most of that worth is extremely volatile and can quickly dissipate if the stock price falls for whatever reason. Would you count a falling stock price as spending?
Amazon aggressively reinvests its extremely large and stable earnings into the business which Bezos owns a large part of and controls actively. Both he and his ex-wife have realized extremely important liquid wealth by selling a significant part of their stakes. How would you measure his wealth?
Certainly Amazon revenue is not the best way.
Meanwhile, the difference between the US and Europe in the article is around $10K per person--hundreds of times larger than the distortion created by the billionaires.