You're knocking on the door of a much larger issue when you expand the discussion to artists and programmers. Game dev (at least in the US) is run like everything else in the tech industry. Everyone's on salary and everyone's expected to work as much as is needed to get the job done. There is no overtime and there certainly are no unions.
Applying the union model to tech is an epic culture clash waiting to happen. If organized labor actually takes hold in the games industry, things will get... uh... "interesting".
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