You'll note that the CEO at no point says that the after-hours work is actually a part of the employee's job description, she's just expecting them to do it bec

You'll note that the CEO at no point says that the after-hours work is actually a part of the employee's job description, she's just expecting them to do it because... "your best bet is to hire people who share your passion, willing to 'volunteer' on such occasions". The key thing about volunteering is that it's voluntary.