You've got it backwards. If unions are needed, it's at places hiring replaceable people who are making widgets or following a standardized cookie-cutter process. Those laborers need their job, are cheap to train, and easy to exploit. Unions are NOT needed in more creative areas staffed by white collar professionals who can move freely between companies.

Obviously there is some overlap here, where some professionals are more replaceable than others, depending on the profession. Artists certainly form guilds when they think it will help them. With game companies, there may be exploitation (corporate AAA studios have turned games development into a cookie-cutter process), but that's because the employees wanted to work in the games industry no matter what the cost. They could get an easier job at some other software house. They'd rather work at EA. It's their choice. 🤷‍♂️