> Anyone can start a company and contribute the money required for that company.

No, anyone can't. That's the point. If the money is siphoned out of the lower class, then they have no capital (or free time) to start a business. They're barely getting by. It's a positive feedback loop in both directions (up and down). Rich get rich, poor get poorer (in general).

If you are upset about 'rich get richer, poor get poorer', you should read up on quantitative easing and how it inflated assets if you're not familiar with the topic yet.

Anyone in the USA can. I've met people who started successful small businesses doing things like landscaping and pest control with basically zero capital or free time. They just went ahead and did it.

If you try hard enough you can always find an excuse for failure.