What do you mean immediately dismissed? Like you don't have to go to work but still get paid, right? Or do they get fired? After they quit?
Of course, power dynamics being what they are, it's the worker who pays the price.
Completely OT: I absolutely know what you mean, but ugh, corporate jargon.
I do feel a bit ashamed of unironically using "sunset", although in my case it was more in the sense of "ride off into the ~". It was my last corp job (hopefully) ever.
"Dismiss" is a fairly common euphemism for "fire", like "let go".