Think about it for a minute. The rich people hoard all the resources, financial assets, means of production and in the competition for resources they will (and are doing so) displace everyone else in the economy (and really from society also).
This means that those who are displaced have no means to participate in the economy. And not only that but also they will be pushed to the fringes of the society and exists in slum conditions. This will stiff the economy and hollow it out.
Let's say for arguments sake that the government taxes X hundred of millions of $ from the bezos/musks/gates/etc. and put that into the economy by
- indirectly or directly hiring people
- building infrastructure
- providing services for the citizens (education, health care etc)
- providing benefits to those who need.
By letting the uber rich hoard the wealth that wealth is essentially away from the economy providing very little economic activity.
In economy this is known as the "high propensity to spend". The "poor" (i.e. working/middle class people) have high propensity to spend, the rich have low propensity to spend.
Tax the wealth, not the work!
This has been done before and it can be done again!