It would be interesting to see a court ruling that the output of LLMs trained on copyleft code are licensed under the GPL ... and all other viral licenses simultaneously
No, the copyright is the colour of the bits, and red bits with a comment saying "these bits are blue" are not blue bits, but you may be prosecuted for fraud.
It's new, fast-moving technology, and the courts are slow and expensive.
It would take two stubborn businesses with a lot of money deciding that it is better to battle it out than focus on their business. Something like IBM v SCO or Oracle v Google.
It is quantum legality, to use copyright input is legal or illegal depending on the observer.