[triceratops]

Training itself involves making infringing copies of protected works. Whether or not inference produces copyrighted material is almost beside the point.

[johanyc]

It’s legal if it’s fair use, which is yet decided by court

[yunwal]

No it doesn’t? You can buy a digital copy of Harry Potter and use it for training. No infringement needed.

[triceratops]

Only as long as it's not copied again during training. You can't make copies of your purchased digital copy for any reason other than archival.

[Retric]

Incidental copies during playback are also allowed. But none of these companies are paying for copies in the first place.