The internship is unpaid, but the CMO (Jun) really does go out of his way to make it a learning experience. He even let's us decide what we want to learn about, and then researches it. It's kind of like marketing class

time will tell I think. The companies too young to have a rigid corporate hierarchy you can climb... If it takes off, I feel that some of the top interns might be offered positions

Right not this is an extended internship for a lot of people, but if the company starts growing and earning money, it seems possible that current interns will be considered for a full-time.

No compensation but the benefits are totally worth working for the company!

As a small company, there isn't much of a hiarchy to grow within the firm yet. However, the company is growing really fast and there are ample opportunities to growth with the organization. Strong performers in the organization become recognized, and when there is an opportunity, will level up within the firm.