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I'm not sure if I understand this one - can you elaborate?

A customer would have a chance of getting code written for free provided that he/she is willing to put in the effort to understanding the result.

More people might be willing to get others to write code for them since there's a chance it would be done for free.

Moreover, such a business model would have the beneficial effect of enhancing familiarity with and appreciation of programming.

How would you determine if a customer understands your code or not? Would you quiz them?

Yes, you or a 3rd party would quiz them.