Diablo also unionized and there's some representation in non-game teams like Battle.net. But I also know (I'm in games and in OC myself, loads of friends at local studios from SD, to OC, and LA counties) that they had a demonstration last Thursday, at 2PM Pacific Time they walked out. They claim that leadership is not negotiating in good faith.
I wonder if that's why we got a diablo 2 expansion 25 years after the fact. Can't easily terminate the union employees, so give them something to do. "Here, create a new expansion to a 25 year old game. That'll keep em busy for a while! Har Har Har"