system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how are unpaid internships still legal?

I know universal just got sued because of this. 

But how, even for credit (which most people have to pay for), is this practice still legal.
gpt
Basically the same reason why volunteer work is still legal.

Companies that offer unpaid internships almost always have you sign a document that essentially boils down to you agreeing to do your work on  a volunteer basis.