Earlier quoted context omitted.
Are you suggesting that films can be classified as either “union” or “amateur”? Star Wars is an amateur film then. And saying “amateur porno” is redundant.
> Star Wars is an amateur film then Based on what? There are many unions and they have changed and stabilized over time. SAG-AFTRA https://www.sagaftra.org/about/our-history is the one that is distinguishing. The Director's Guild (which George Lucas and others, had spats with) or a writer's guild, etc have traditionally been little more than elitist extortion committees.
Based on the SAG boycott on non-DGA directors.