While in reality, where you take into account the statistics of business success vs failures, this is one of the riskiest things a person can do if you don't have any access to a safety net in the very likely scenario your business will fail.
A business can fail for many reasons completely out of control from an individual's agency, a person who needs to provide for a family might not have the risk appetite for plunging their families' lives into that, it's impossible for everyone in a society to become a successful business owner. You are advocating for an impossible situation, and by negating that a majority of society won't have the means to access the successful-business-owner class while gatekeeping the fruits a society collectively built to only that class you are being inherently unjust.
No successful business can exist in a vacuum, the better educated a society is the better chances a business owner can find skilled people to build successful products, the better chances there are for these workers to innovate, and create a disproportionate return to investments.
You completely left out that these business are only possible because of the society that supports them, it's an extremely extractivist mindset which I deeply challenge you to think deeper about...