The matter is also somewhat complicated in that Bezos's wealth isn't exactly fungible. It is calculated based on the market value of the stocks he owns, but that isn't quite money. If he tried to access a large enough chunk of it, the actual value would become significantly lower. If you nationalized it in order to sell it and generate revenue for social programs, it would be worth much, much less that its currently stated value. It is wealth, but it is not money. While it may look like it since it is quoted in dollars, there isn't actually a 180 billion dollar pile of money sitting unused.
A better measure for inequality may be spending capability ( as in how much money one can reasonably afford to consume, regardless of availability of goods.), Mind you, even with that he is waaaaaaay richer than any common person, but that is a more accurate representation , if difficult to calculate, of how much richer than the common person he is.
Due to the way those huge net worths are tied to the market worth of businesses rather than actual physical stuff owned or money, it can be hard to fix without creating some perverse incentives or suboptimal situations. For example, if you have a wealth tax on shares, you basically force companies to issue enough dividends to pay the tax. Lets say, a 5% tax on all shares. For anyone to afford holding the company, that company needs to pay at least 5% dividend or owning it becomes extremely costly; since revenues are often quite a lot less than worth of a company, it becomes crippling. Of course you can have a threshold, but then you are incentivized not to grow your company. Which could arguably be considered a plus actually, with an incentive toward smaller companies. More diluted ownership is also a possibility, the effects of that I honestly don't know.
Point is, going directly after that accrued value has a lot more consequences to everyone than just lowering unequality.
I wonder if going after corporations themselves wouldn't be a more effective route, closing some tax loopholes and exemptions.
But regarding wealth accumulation itself, a favourite of mine is an inheritance tax. Let people earn and keep a lot in life, but don't let it accumulate across generations to make aristocracy.