That's a good point. It seems about right that license terms are all about the cases where the code is used "commercially", for some sense of "commercial". If t

That's a good point. It seems about right that license terms are all about the cases where the code is used "commercially", for some sense of "commercial". If the code is never used commercially, there's never a reason to enforce the license. Maybe the most effective non-commercial code license is the most popular license on GitHub: the null license. (If someone's about to reply "You can't just use code you found on GitHub without a license, you can get into all kinds of trouble that way", that's exactly my point about using code with a "non-commercial" license.)