IANAL, but I'm fairly confident that you're wrong about CA requiring severance pay under the WARN act, and I don't think you should be giving legal advice if you're not a lawyer. Your post can mislead a lot of people on HN.
Actually, you don't understand Zynga since you're relying on rumor and hearsay. I've worked as Zynga. Things aren't as black and white as you think they are.