[graemep]

> so they cannot themselves provide permission for others to be able to legally copy.

If something is not covered by copyright law then others do not need permission to copy it. However, you cannot impose conditions on copying it either (not even minimal conditions like the 2 clause BSD license).

However you can enforce licenses in jurisdictions where even pure vibe-coded LLM output is covered by copyright. So you might find yourself in a position where, for example, you can enforce the GPL on your vibe-coded software on someone in the UK, but not someone in the US.