As long as some of the code is written by humans it should be enforceable. If we assume AI code has no copyright (not sure it has been tested in courts yet) then it would only be the parts written by the AI. So if AI writes 100 lines of code in Ghostty then I guess yes someone can "steal" that code (but no other code in Ghostty). Why would anyone do that? 100 random lines of AI code in isolation isn't really worth anything...