You've hit exactly what this lawsuit is about. They aren't saying "when I got a job as a content moderator I wasn't expecting to see traumatizing things", they'

You've hit exactly what this lawsuit is about. They aren't saying "when I got a job as a content moderator I wasn't expecting to see traumatizing things", they're saying "my employer isn't providing adequate protections from the things I have to see as part of my job".