[jonas21]

As they mentioned, the piracy part is obvious. It's the fair use part that will set an important precedent for being able to train on copyrighted works as long as you have legally acquired a copy.

[wood_spirit]

Cue physical books being licensed not sold in the futur with restricted agreements …

[mormegil]

See first-sale doctrine <https://en.wikipedia.org/wiki/First-sale_doctrine>

[pier25]

Also music, videos, photos, etc.