You say "no", then you say stuff that supports what I said. They ARE free to choose what to do. Dividing types of labor carries some dangers, but also has big advantages
"Exploited" is a narrow and overly negative way to view it. I have mostly preferred to have a job where I specialized in one thing and let others do finance for example. Free choice
We are btw quite free to set up companies where "everyone does everything" if we want. Groups of people who specialize for different parts of a job will likely be more effective though
And I would argue, the increase in efficiency might make everyone in the group richer than if nobody specialized. Also be aware that some people are only fit for some jobs
