This is a wonderfully uneducated response to the above point.

Go google "natural monopoly" please. No one is arguing that work is not happening to provide a service.

We're arguing that capitalism clearly fails to achieve good outcomes for optimizing the quality and cost of that service in the case of natural monopolies.

Virtually nobody argues that completely free markets should be used for services that are natural monopolies. The actual debate in practice is between rate-regulated private companies, public owned but privately operated companies, and publicly owned and publicly operated companies. There are good and bad examples of all three.