Become ungovernable

Well, if you're not depending on the job for income or for room and board then an unpaid internship is a great way to gain experiences working for companies you probably wouldn't be qualified to work at otherwise. Many colleges use unpaid internships as part of the requirements for graduation. They are a great way for students to get real world on the job experience before they become reliant on their job to live. It's also a great time to learn whether or not the job is actually what you think it is and whether you actually like it. So while they're not getting paid money for the job, they do get college credit for the job.