Additional figures, fresh graduate CS major worth about 30k USD per year.
Yes, that reduces the pool drastically. You are essentially finding the intersection of students that believe in your challenge over immediate compensation, and do not have financial constraints. But to quote the quoted Chris Dixon: "People who say recruiting is hard are right. People who say it is impossible just aren’t showing up enough."
Reaching out to this group of students is about pitching yourself right. And as the post highlights, understanding the motivations is an important first step.
Not every company needs interns, and if you can't afford to pay them, maybe you don't need them quite yet. If you want to recruit people as full-time employees or something, on the other hand, that's an entirely different argument.