Not sure how they are going to enforce it. Come to your home, kidnap you, and then keep you until you decide to work or explain why you quit?
@nblumengarten yup. It's also a terrible strategy for management. Instead of encouraging folks to give at least some notice so you can cover shifts, as you mentioned, they'll just walk out.
@Kinnison
I'm sure the enforceability of it is moot, it's really a scare tactic.