Nitpick - they're not (just) using public domain code for training - they're using "publicly available sources, including code in public repositories on GitHub.

Nitpick - they're not (just) using public domain code for training - they're using "publicly available sources, including code in public repositories on GitHub."[0] This includes a lot of code under copyleft licenses, and possibly even more code under no license at all (implicitly All Rights Reserved). It's not obvious to me that it's ethical (or possibly even legal) to sell a model derived from code not in the public domain. [0]: https://github.com/features/copilot https://github.com/features/copilot