I wouldn't call them frivolous. Quite a few people believe training generative AI models on their copyrighted work and providing others with access to that model violates their copyright. IANAL but it seems a weak argument to me. And it seems weak to some IP lawyers I know as well.
It also seems like technology that can't be realistically bottled back up. However, I wouldn't call lawsuits frivolous and it might actually be useful to get some legal clarity