I wonder if anyone has tried going in the opposite direction? Someone like adding to their license: “by training a machine learning algorithm trained on this source code or including data crawled from this site, you agree that your model is free to use by all, will be openly distributed, and any output generated by the model is licensed under open source terms.” (But, ya know, in bulletproof legalese). I guess most of these thieves won’t respect the bit about distributing. But at least if the model leaks or whatever, the open source community can feel free to use it without any moral conflict or legal stress.