> The prospect of being sued because the LLM outputted training code you're not allowed to use, or to relicense, is exciting?

The problem with this is that if someone sues you for this they have to somehow prove that you actually infringed. They can't just point to the code and say "See, mah, infringement!" The legal system does recognize that it is very possible for two people, completely independently, to arrive at a nearly identical solution.