Maybe they've solved the fingerprinting problem and can identify text generated from their model, and this is a way of discovering the market they can sell more advanced models to directly. B2B leadgen...
I don't think so because I believe you can train AI models against other AI models. I believe you can fingerprint a family of models, but that's not going to tell whether you just used the general approach outlined in the academic papers.
That would prbably work to detect if e.g. OpenAI or Anthropic start using their weights directly. It wouldn't detect whether e.g. a blog was generated with their model or not.