I doubt that much software is entirely AI-generated with no human review or testing, it’s probably more like integrating some public domain snippets you found online into your code (which doesn’t invalidate copyright on the rest of it, or the way it’s put together) or having some files auto-generated by a script (like a C header containing a lookup table for a simple mathematical function, the table isn’t copyrightable itself maybe but the software as a whole still is)