I used to work at Facebook, and it was always interesting to me to see just how many engineers were actively against - aghast, even - at the idea of unions. Whenever it would come up on the internal boards the arguments were usually along the lines of: * "People who don't deserve to be paid more will get more money under a union" * "I'll be paid less under a union" * "Unions will slow us down, and we'll become more b…
Writing and acting are race to the bottom. There are plenty of people who would be willing to act for free. You can't say the same for working at Facebook.
In order to stop the race-to-the bottom SAG-AFTRA artificially constrains the marketplace by forcing studios hire a certain number of union actors. In this case, it doesn't really hurt newbies because they'd otherwise get paid peanuts anyways. However, that isn't something that people would want in tech expect perhaps in the videogame industry.