I just read an article that isn’t related specifically to logos, but it’s one of the better collections of words in favour of saying no when for-profit companies ask for free work.
“This isn’t just about unpaid labor. One reason people, especially young people with creative aspirations, work for free is to form valuable relationships that will push their careers forward. But you can’t form a valuable relationship with a rich person who can afford to but won’t pay you a reasonable wage, because your entire relationship with that rich person is based on their failure to acknowledge the value of the work you’re doing for them.”
A good read, via Steve Douglas.