Everyone with two neurons to rub together knows their “notice” is nothing more than a fig leaf. They know it’s impossible for more of the people there to actually evacuate.
The whole premise of the argument is that the workers in question are getting paid shit wages, so they’re barely getting more than basic survival anyway. So I ask again, why would people put up with that when they could be using that time to look for a new job, learn new skills, become self-employed, etc.? How could giving workers the leverage to quit without the fear of becoming homeless possibly result in them having less leverage over employers than they do now?