(Notably, John Grisham and George R.R. Martin are plaintiffs.)
It cites OpenAI's justification (which is how I found it) and tries to refute it. Whether the court will agree remains to be seen.
Other lawsuits: Silverman vs OpenAI https://www.courtlistener.com/docket/67569254/silverman-v-op... (complaint PDF: https://storage.courtlistener.com/recap/gov.uscourts.cand.41...)