Nothing in America stops the workers from owning the factory or the profits.
Fully stop? No, not technically. But our society makes it as close to impossible as it can be without being illegal
Sure: becoming a member of a corporation costs money. You either have to pay to get it set up or buy a share to get in so those who already paid are made whole.
Unfortunately, the US as an example, our society is structured such that the majority of people here have zero savings with wages decreasing in value every year due to inflation. A person in this situation cannot produce money to buy-in; squeezing water from a stone situation.
All people are essentially born with no assets, and if they want to secure wealth, they must sell their labor to achieve it.
In other words, children of parents who own an outsized number of assets do not have to sell their labor to achieve it, because it is offset by their parents assets. This inherently produces an unequal/unbalanced system where some people simply never have to work this way. This is why extremely in-demand internships at companies in places like New York City are often unpaid, and thus generally end up going to people who already have money, access, and support systems. Because only those kind of people can afford to take on an unpaid internship to move upward in the capitalist system.
This is also the source of generational poverty, because it can be really hard to escape when generation after generation are born to no assets.
Look at the current environment in America. Look at the absence of worker co-ops besides like Winco. Why aren’t there more? What factors are at play that is seemingly preventinf the natural formation of worker co-ops if they are allowed? Are children taught they can do that? Do people getting MBAs learn this in their classes? There are a lot of questions to ask here. While we do have some examples, for whatever reason they are not common here. I do think it has something to do with the resources the average citizen has available, the current ecosystems within existing markets, and all around education of the average American citizen.