What use case is there for a user application to access the ambient light sensor?

I think you can be sued in the civil court for anything if someone has the time and money and can convince a lawyer to take up a case against you. For copyright infringment, you can also be criminally prosecuted in some cases.

If Meta win this lawsuit, does it mean I can download some open source AI and claim that “These million 4k Blu-ray ISOs I torrented was just used to train my AI model”?

Heck, if how you use the downloaded stuff is a factor, I can claim that I just torrented those files and never looked at them. It is more believable than Meta’s argument too, because, as a human, I do not have enough time to consume a million movies in my lifetime (probably, didn’t do the math) unlike AIs.

But who am I kidding, I fully expect to be sued to hell and back if I were actually to do that.