Hollywood unions are a slightly special case: while the studios hold a huge amount of power, the staff are pretty much all contractors per-project, and the entity they're contracting with will be a special purpose corporate vehicle for that film. Most software doesn't look like that - except game development, which is notoriously abusive and can get away with it because of a fresh supply of enthusiastic young people.
You don’t get into the Hollywood unions until you put in hundreds of hours of set time, most ADs I know don’t get the corresponding benefits until they are about 30.
