You look at the problem from principles, while I look for the outcomes.
When to the third point - well, it is up to the author, and I respect that (regardless if I would do the same thing). People have the right to not share it at all, or share it as a copyrighted piece of software, or with any other limitations. Though, all limitations (and copyleft is a limitation) affect its usage.
They differ because author of the code did not agreed to use his code to teach LLM.
> Second, if the code is hosted anywhere else, there is no guarantee that Copilot (or another model) won't learn from that
This issue should be resolved not by author of the code, but by Copilot or any other LLM team.
> Third, for me, the crucial part of open-source code is maintenance.
Even if author is against it? This is a valid argument, but results is not very different from pirating of software.