This post makes the mistake of counting unrealized gains as income. That's not how taxes or investments work. Unrealized gains are NOT income. That's how they mistakenly come up with the number that he pays less than 1% in income tax. Investments, in general, are not income (unless held less than 12 months or if they pay dividends).
Imagine you had to pay income taxes every year on the unrealized gains of your 401k, house, and car value. You too would be said to be paying a very low income tax rate. But again that's not how income taxes work because none of those things are income.
If Bezos were to sell those shares and actually realize those gains then he would be rightly taxed but that would also likely tank the stock as his 8% ownership is significant enough to drop the price drastically. 55% of Amazon is owned by 401k and other retirement accounts so if the price tanks average Americans take a huge hit.
Bezos does sell shares, all the time actually. You can see this in the SEC filings. And he is rightly taxed on those realized gains. But he's not going to sell all of his shares as that would be damaging to Amazon, the workers, retirement accounts, and his own investments.
Instead, the money stays in the company paying worker wages, buying new facilities, etc. This is even better for the economy because it keeps the funds in circulation. This generates even more tax revenue than if he did a 1 time sale of his investments. That's why unrealized gains don't get taxed, because its financially a worse outcome than keeping the money in circulation.