You might be surprised. It's really complicated. Based on my experience with companies such as twitter, they are so finicky about not doing stuff like this.

It's not just altruism or for employee moral. It's clear some of the companies are simply deciding to not rock the boat by firing people. This can be more legally complicated than it seems.

Anyway, I'm not really saying one way or another, but it seems to follow that if others are taking measures, there might be good reasons for them. I would be surprised if the Elon / twitter don't get sued by this; multiple times.

I think contracts aren't enforceable unless both sides get something.