It depends on the internship. Lots of internships seem to be of the "do all the shitty jobs that nobody else wants to do because you are free labor" variety, a

It depends on the internship. Lots of internships seem to be of the "do all the shitty jobs that nobody else wants to do because you are free labor" variety, and not the "trade the salary you deserve for lots of mentoring and training while we help prepare you for your career" variety. If the internship is Google's Summer of Code, that's one thing, if it is fetching Mountain Dew's and snacks for the guy that's actually building something, that is something else entirely.