There’s a lot of Musk hate all over the Internet and irl, not just this site. For good reasons too, but I don’t think the issue is that he didn’t testify, it’s because he wants regulators to be punished for enforcing regulations. That kind of attitude screams “I am above the law, punish these people so no one tries to hold me accountable again.” to me.
Alternatively, and possibly almost as useful, companies will end up training their AI to detect AI content so that they don’t train on AI content. Which would in turn would give everyone a tool to filter out AI content. Personally, I really like the apps that poison images when they’re uploaded to the internet.