The ability to just pull a project of this scale to completion is something that virtually no 21 year old has. That alone is worth something to a company with some sense.

There's obviously a strong foundation for the hard skills (like visual design or prototyping or copywriting) that can be easily built upon in the field. That's the whole point of an internship: find a hard worker with a good foundation, teach them how to succeed in your company.

Not sure what the hell parent comment's problem is.