Barely anyone actually owns their business outright, first of all. Second, why would anyone work for a business if they have to pay the owner to work there? Because they need to be able to eat and want to be able to buy shit they want. People produce because we want and need the outputs of production. People create companies because some (most) things are better made with multiple people rather than one guy by himself. There is no difference between the workers choosing to start a business and sharing in the collective outputs of their labor and a owner buying a a business and finding people desperate enough to exploit themselves for survival, except in the first arrangement, there doesn't have to be the threat of destitution baked into the functioning of the economy. People want the outputs of labor, so they'll do labor to get them. Pretty simple.

Edit: In person, the real response is "So you think that Worker-owned businesses like Bob's Red Mill, New Belgium Brewing (before they sold), Mondragon*, or any of the 400+ co-ops on this list: https://www.usworker.coop/directory/ don't exist?"