> the onus is on you to prove it
which would be easy during a law suit - the process of discovery means you get to check out the training dataset.
The allegation isn't that the AI trainers are hiding, but that what AI trainers are doing _itself_ constitutes copyright violation. AKA, they want the right to use the works to train an ai model to be a right that must be explicitly granted.
If you want to prove your data was used to train an AI, the onus is on you to prove it. Good luck.
The AI who follow the law strictly will be at a disadvantage to those that do not.