I'd like David to explain how Musk creates wealth. Does he have a printing press in his garden to churn out dollars for him?
Rich people get rich by moving money from consumers to their pockets. The money the consumers used is created by governments, which are the only issuers of the state currency. Even though banks are able to create money for loans they can only do it with the approval of the government and even then, the money that they create actually comes back to them when the loan is repaid. BUT, it comes back to them PLUS interest, which is paid, not from the money they created, but from the government created money. So they, too, only account for money moving around the economy, not the actual expansion of the money supply. Once the money comes back to them it is virtually destroyed, plus they've sucked a bit more out of the economy.
So, at the base of this process are people, as others have pointed out. The people who actually make the product, or carry out the services offered by the entrepreneur, and the consumer who buy the product or services.
The trillions of money held by wealthy people represent the money that states have issued over the years which the states haven't been able to recover from them via taxation.
When it comes down to it one has to ask, is it a valid use of state created money to allow it to accumulate in the coffers of the wealthy, where much of it does little other than suck in more money by way of dividends and interest, or should it be more evenly distributed to enable all citizens to live reasonably comfortable lives?
Obviously the wealthy have one answer to that question... so do their sycophants. But what about the rest of us?