@msw >not on a "viral license" that ensnares the unsuspecting, forcing them to "release their source code" for unrelated works. There is nothing under copyright law that lets you apply terms to unrelated works, so I'm not sure how you would do that with a license. The only thing that I can think of is trying to massively overreach with contract law, but going that far is invalid...for now (contract law is heavily weighted towards the one who sets the terms, but blatantly unfair contracts are still rejected by courts).
>tell me about your intellectual property philosophy The only philosophy I have on "intellectual property" is that it's a massive con to confuse people between copyright law, trademark law, patent law, trade secret law and many others and anyone that writes it without quotes is either confused, or is trying to confuse you: https://www.gnu.org/philosophy/not-ipr.en.html
"intellectual property" does not exist, merely because an idea is not and will never be property no matter what conmen say.
So, no, it is _not_ time for a “CopyLeft AI Data License.”
First, tell me about your intellectual property philosophy. Tell me about your social and societal goals. *Then* we can talk about if #copyleft is a suitable tool to help advance your agenda.