[cwkoss]

That manager is toxic and should be reprimanded and/or fired. The employee certainly has no ethical obligation to do them any favors, but it could prevent that manager from abusing current and future workers in this way.

This is a situation where the interests of the workers aligns with the business's ability to succeed. Why not leverage that to try to improve working conditions there? Seems like a win-win for everyone but the toxic manager.