Nothing is really preventing this though. AI companies have already proven they will ignore copyright and any other legal nuisance so they can train models.
The enterprise user agreement is preventing this.
Suggesting that AI companies will uniquely ignore the law or contracts is conspiracy theory thinking.
"Meta Secretly Trained Its AI on a Notorious Piracy Database, Newly Unredacted Court Docs Reveal"
https://www.wired.com/story/new-documents-unredacted-meta-co...
They even admitted to using copyrighted material.
"‘Impossible’ to create AI tools like ChatGPT without copyrighted material, OpenAI says"
https://www.theguardian.com/technology/2024/jan/08/ai-tools-...
https://www.vice.com/en/article/meta-says-the-2400-adult-mov...