Would this be legal in any jurisdiction (click-or-be-fired)? I am not familiar with US labour laws, are employees actually at the level of indentured servants considering terms of employment (which I would expect to be a contract between TWO parties)?
In the US, in most (all?) jurisdictions, your employer doesn't really need to have a reason to fire you. They can fire everyone wearing red shirts, if they wanted to. There are also very few places providing leave (outside of white-collar positions). For example, my wife was given two weeks off from her job after having my son. The state we lived in only required maternity leave to be implemented at companies having…
So, if a company says "we're firing everyone wearing red shirts", then you can potentially contest that. If they fire you without a reason, then it's legal. If you can prove there was actually a reason, and that the reason was illegal, then you can sue them for wrongful termination