Then why not say it's not allowed to upload code you don't have copyright to? This would make sense, nobody would question it and it would generally also cover AI-generated code.

Mentioning vibe coding just upgraded it into a social and moral topic, while the sole fact that AI generated code is no issue at all, just that there is not a general concensus in the world who holds the copyright to that code.

It's kinda like blanked banning cooking, because you can't cook without a knife, and knife can be used as a weapon.