That’s a great point and actually a perfect example of how I really feel when I say “work hard enough to not get fired”. Should also add, “so long as it’s not at the expense of your coworkers” to that saying.
It means only working as hard as you’re paid to. If the multi-billion dollar megacorp you’re working for is only paying you $18/hr, you only put in an $18/hr effort; i.e. Work just barely hard enough to not get fired.