Some companies offer unpaid internships to photographers. Typically, the company requires the photographer to supply camera equipment, computer and car. In return, the photographer can work up to full-time hours and get nothing in return except a credit line.
These “internships” are illegal.
From the Ontario Ministry of Labour:
The fact that you are called “an intern” does not mean that you are not an employee for purposes of the [Employment Standards Act]. Generally speaking, if you perform work for another person or a company or other organization and you are not in business for yourself, you would be considered to be an employee, and therefore entitled to [Employment Standards Act] rights such as the minimum wage. There are some exceptions, but they are very limited, and the fact that you are called an intern is not relevant.