It's hard not to read this as giant offense to the authors. I didn't think anything would be worse than DRM, but corporations paying pirates to steal books is right up there.
I don’t think you realize just how huge the holdings of the shadow libraries are now. They have publications from all over the world, in myriad languages. (Someone has made a tool to visualize ISBN-space on Anna, I think it was posted on HN a while back.) It’s not realistic for a corporation, even a multinational titan with a large staff, to track down and compensate even the living authors, and a substantial amount of authors are dead and the current copyright holders are unknown.
Then they shouldn't use those materials to train their LLMs.
So for the first time, peoples who had generally been left out in the internet age are now able to perform queries in their own languages, and people from elsewhere doing queries now get to draw also on the information from these parts of the world. This would have never realistically happened under any copyright-respecting project that painstakingly sought author or publisher permission; there just will never be sufficient manpower or funding for specifically that.