"To summarize the analysis that now follows, the use of the books at issue to train Claude and its precursors was exceedingly transformative and was a fair use under Section 107 of the Copyright Act. And, the digitization of the books purchased in print form by Anthropic was also a fair use but not for the same reason as applies to the training copies. Instead, it was a fair use because all Anthropic did was replace the print copies it had purchased for its central library with more convenient space-saving and searchable digital copies for its central library — without adding new copies, creating new works, or redistributing existing copies."
https://fingfx.thomsonreuters.com/gfx/legaldocs/jnvwbgqlzpw/...
IANAL and don't know how significant this decision is, but it is, at the very least, how one judge views it.
Personally, I don't think judges will rule a certain way because of the money involved but because it seems clear that training a ML model is highly transformative.