That's a good question.
I would like to give you a little bit of insight into the life of performers. Number one, they know very well that if they are difficult, or perceived as difficult on the set, that will get around, and they won't get another job. Performers show up wanting to please the director, the producer, and people on the set. They show up far too often in the morning at 6 a.m., showing up for their hair and make-up. They're given a contract and told, “Just sign this, or else.” They're given a thick contract. They're not lawyers. They don't have a lawyer with them, but they know the reality that if they don't sign, giving away whatever it is that contract asks them to give away, they're not going to get that job, and maybe another job.
They're precarious workers who really have to be concerned about their next job. They can't be the ones who are holding up the rights that they should have in this society. You've heard about the struggling performer or the struggling actor who has to have a second job, often in a bar or a restaurant. That's the truth. They can't pay the rent on the income they make working in the job they love, and then they have to face the realities of being perceived as not being easy to work with.
They sign these contracts, and they don't know what they're giving away.