Saying, that you are not free just because you decide to work for someone feels like an intellectual equivalent to saying, that god exists because tree.
@LukeAlmighty I feel that most of the time this argument is made by lazy people trying to avoid responsibilities, but there are circumstances under which it's valid imo, mainly under some monopoly where your rights aren't technically violated, but there's only one available employer and not feasible to start your own.
Or with an example of speak, when majority of communication is done on the internet, but nobody wants to provide your service to host your legal site, none of your rights were violated, but your ability to say things gets in effected limited.