The Thomson Reuters case [1] is the most relevant in the court's finding that the copying of copyrighted material from Westlaw by Ross Intelligence was direct copyright infringement and was not fair use.

The purpose of training in many of the AI Labs being sued mostly matches the conditions that Ross Intelligence was found to have violated, and the question of copying is almost guaranteed if they trained on it.

[1] Thomson Reuters Enterprise Centre GmbH et al v. ROSS Intelligence Inc. https://www.ded.uscourts.gov/sites/ded/files/opinions/20-613...