I find that many people conflate capitalism with free markets. They are different things.

Free market economies are ones where many businesses which provide competing products can use price as a parameter on which to compete. Even in famously free market economies, e.g, the United States, some things have prices regulated by the government. Think electricity, certain prescription drugs, other things deinfed in the arena of "utilities" or "necessities" for the general public.

Capitalism, on the other hand, is where there is an ownership class (which does little or no labor) and a labor class (which does most or all of the labor), and an portion of the compensation for the value that the labor class produces is redirected to the ownership class. Some of that is reasonable; I think it's true that putting capital at risk in order to start and operate a business should come with some kind of reward.

However, the amount of reward that the ownership class realizes is often far more than is reasonable, and the effect is that the labor class is drastically undercompensated. This amounts to wage theft, above and beyond the already common kind of wage theft that includes unpaid work hours or withholding agreed upon compensation for unjustifiable reasons. Furthermore, again in the US, the amount of risk that owners assume when staking their capital is very low or nonexistent; profits are privatized, losses are socialized. The labor class gets the double whammy of being undercompensated on one side, and paying for business failures on the other.