> other people would need to be poor

Just like billions are not about "being rich", this is about CONTROL. Control of the economy, and how people live, and control over one's own life.

Abstraction is a beast, putting everything regardless of what it actually is as some $$ number is terrible for understanding. The billionaires don't have Scrooge McDuck money at home where they swim in coins, they control huge parts of the economy.

And as long as they need workers, they will want them to live not too well - that would raise the price of labor, if people wanted to do work in places like Amazon warehouses to begin with, if they had better alternatives not working for the billionaires.

Being "poor" in this context means having a lot less control over how you live, not that you live on the streets. Although, as soon as you lose your value, e.g. by getting too sick, that is always on the table too.