According to the granddaughter of a (late) disgruntled Disney animator they found plenty of low-wage animators here in the states. That was the fist age of Disney animation. The second age began with The Little Mermaid and unionization efforts began around The Lion King

Hollywood is notorious for short-changing talent and crew, which has been cause to disregard its grievances about piracy. The studios also routinely pirate media, themselves when they have a mind to.

Regardless, there really isn’t room to negotiate, especially if striking is the only bullet the unions have chambered.