In this way, it is different from literal theft. Stealing money/objects from a thief and keeping them is not justified.
An analogy might be a baker stole 20% of the flour used to bake their special bread, which was then stolen. Both thefts are obviously wrong and bad.
"Judge approves a $1.5B Anthropic settlement over pirated books used to train the Claude chatbot"
https://abcnews.com/Technology/wireStory/judge-approves-15b-...
In this case: resolve the theft claims against the US frontier labs, and only then let them make claims against third parties. It would be totally unreasonable for (say) OpenAI to extract a settlement from Moonshot and use that to pay its own claims. Ordering matters.
Same thing here. This whole situation is just comical.
Now, if that kid were to print the bootleg translation and sell it to schoolmates, that's worth a slap on the wrist. The kids willing to pay would likely have paid for official copies.
When these LLM labs download our works, feed them into their models, and sell the output to people that used to pay for our work, that's worth a very hard slap. I honestly have less of a problem with the open models.
It seems like you think theft is bad everywhere except when Anthropic does it.