Doing something in exchange for a chance to get a job is 100%, completely, in every sense of the term voluntary.
If I don't pay Apple, they won't give me an iPhone. Am I involuntarily paying Apple for my iPhone?
As for the camera, a mafia-esque threat of "if you don't have a camera, we get very suspicious" by a government which has the power to prosecute and put people in jail, is incredibly coercive and horrifying.
Amazon is making you an offer, which if you refuse, leaves you no worse off than the status quo. If you accept their offer, there is potentially a job which you are apparently interested in, since you are applying.
