Many have no problem with these 'exploitative relationships'. Likely because there is nothing wrong with them.
Or, they simply aren't aware of the situation. They could even be convinced that they live under the best possible conditions. Slaveholders work hard to convince their slaves, and themselves, of such false realities. For example, they basked in the notion that slavery was their burden, that they toiled to save the poor Negros. Rebellious slaves were just ungrateful. Now we have wage slavery.
As long as all relationships are voluntary however, why does it matter? Without force or threat thereof, there is no slavery.
Via flight, revolt, or purchasing their freedom, couldn't slaves voluntarily chose to emancipate themselves? Slavery is a condition in which you have limited choices due to coercion, just like how the worker finds himself under capitalism.