As a former member of the Cinematographer's Guild (Local 600) I can assure you that the unionization is both culturally strong and plays an important role in workplace safety. Movie sets are dangerous places: explosions, heavy equipment, high powered lights and electrical cords all around...

There was a distinct jump in professionalism (and acknowledgement of safety) when I started working union shoots vs non-union.

I'm sympathetic to the game developers, but unionization has been pretty strong eroded outside of traditionally hazardous occupations.