I agree, but they don't have to work for someone else who extracts surplus. They can organise themselves and work themselves, voluntarily. They then own the products they make and decide how and if to distribute them.

>In free market the employer is paying the wages which could potentially lift the employee out of poverty

In slavery, the slave owner is providing the housing and food which could potentially lift the slave out of being in a state without food or shelter.

The owner and employer both perpetuate the system of oppression, this much is a fact. If there were no capitalists, there would be capitalism. If there were no slave owners, there would be no slavery. If there were no lords, there would be no feudalism.

You cannot escape the fact that the capitalist is taking advantage of the lack of choice and lack of capital by virtue of accident of birth and the property system which the capitalist defends and supports.