> It does not strike me as a legitimate case to strip people of their human right to free agency and will by forcing people to do things they don't want to or may even be dangerous
But in a normal employer-employee relationship, this is totally typical. You can't sign up to be a firefighter but then refuse to go into burning buildings that you find too scary. You can't get a job as a developer and then refuse JIRA tickets you find boring, claiming that's your "human right."
In those cases, and with Uber as well, your free agency is that you can quit the job if you don't like it. But you have no fundamental right to be retained as an employee or contractor while refusing to do parts of the job you'd signed onto. The employer has their own right to terminate you if so.