You don't understand the point of capitalism. It's not about making rich people richer. Capitalism is about producing stuff. To create a large variety of (useful) products for society.

You need capital to make pretty much anything. Somebody has to come up with a large amount of resources (money) put upfront into the venture. Capitalism creates the incentive for that - if the gamble pays off, then the investors get more value back. If it doesn't work out, then investors lose money. Most businesses fail early and do not provide a return for the investment.

The point of capitalism is to keep this system running. As a result of it we have made an ungodly amount of technological and quality of life improvements. Some people have become filthy rich from this, but typically they also provided the world with goods or services that people like and use. Tesla made Elon filthy rich, but it also made electric vehicles popular.