Exactly. A whole lot of people have been sold this idea that "taxing billionaires" is going to solve all their problems and provide endless spending for all the free things they want, but this is simply not the case. First off, the math, even the naive math that assumes that all billionaires' stock can be instantly liquidated at the current prices does not work. As individuals these people do have quite a lot, but there are not enough of them. The politicians constantly mention the same 5-6 individuals with net work measured in the hundreds of of billions, then list the number of billionaires, but the vast majority of these "billionaires" are single digit billionaires, with their net work held in an extremely illiquid investment such as private companies.
If you actually introduced your wet dream billionaire wealth tax that's going to pay for everything forever, all these people would be forced to go to the market at the same time and sell their assets while every other billionaire is also going to be in the same position at the same time, so who are they selling to? The market would crash (also incidentally impacting all your middle class retirement plans) destroying billions upon billions of dollars in wealth. But OK, let's say you get this money now, let's pretend you could get enough, and the government starts spending it on entitlement programs--what you have just done is convert investment into consumption. What do you expect to happen in this case? I'd expect surging inflation.
Society effectively consumes everything that we produce. If we want to consume more, we need to produce more. The government can put their finger on the scale as to what is produced and who consumes it, the government can put policies in place that lead to additional production via removing obstacles from productive activities, introducing obstacles to unproductive activities, making investments or subsidies, etc. but all of this is more complicated and messy, it needs to be done intelligently and carries risk of distorting market realities leading to unintended consequences. This is called "governing" and it's what politicians are supposed to be doing. Outsiders who want power but can't effectively govern are always trying to sell people on these "one weird trick" narratives of easy fixes to hard problems.
Bezos has, I believe, two jets and three yachts along with a number a large homes with large household staff. A lot for a person to be sure, but most of his wealth is unrealized investment in a company that delivers goods to hundreds of millions of people's homes and powers countless tech companies that are used by billions of people. Taking his boats and planes away is just not going to move the needle, it's not going to make groceries cheaper or reduce the price of college tuition or add housing stock (aside from a handful of luxury homes in a couple of neighborhoods around the wold) or add any new doctors to the medical field. Certainly taxes can be increased, but no one should expect this to make a real dent in the budget. We got into this situation by decades of taking the easy route, so of course people are looking for easy solutions.
This is the exact same kind of magical thinking that the right uses to convince people that their life would be oh so much better if they just kicked out all the immigrants. There is no magic bullet, most spending by the government is on the middle class, most consumption is by the middle class (this is even more dramatic if you measure this in real world physical goods terms rather than including "luxury" markup on spending by the upper middle class). This is a huge group, hundreds of millions, that collectively consumes an unfathomable amount of resources, and moving some numbers around on a few computers in downtown Manhattan is not going to change this.