That sounds like a definitional problem though. If a person is choosing to volunteer are they really an employee? I general don't agree with NDAs though, so on

That sounds like a definitional problem though. If a person is choosing to volunteer are they really an employee? I general don't agree with NDAs though, so on that front we definitely agree there's an issue there. Especially for a volunteer, I would never sign an NDA when I'm volunteering my time and effort.