Community service, unpaid labor was part of the Bright Futures scholarships here (they changed it to paid or unpaid work) and was part of the IB curriculum two of mine did too. This is likely true in most states. A lot of high school kids are already doing hours and hours of unpaid community service.

But there is only one real farm inside what I'd define as close enough, an organic community farm that already uses lots of volunteers and unpaid interns and still ends up too expensive for what we got, when we tried buying a share one year. They are not raking in cash at all, either. It just is an expensive endeavor.