Because “free markets, competition, being voluntary” are propaganda by capitalists using their owned media and purchased government to make its victims double as it’s defenders.

The goal of market capitalism is to end competition, manipulate the markets to your advantage using anything from bribery to cost benefit analysis of potential consequences to potential profits, and conspire with your economic sector to coerce the workers you need into accepting less.

This is just expanded indentured servitude with a marketing team.