In the LLM intellectual property paradigm, I think this registers as a solid "Who cares?" level offence.
Claiming to care deeply about IP theft in the more nebulous case of model training datasets then dismissing the extremely concrete case of outright theft seems pretty indefensible to me.
Everyone has a finite amount of empathy, and I'm not going to waste any of mine on IP thieves complaining that someone stole their stolen IP from them.
It’s theft in the way taking a picture of nature that you had nothing to do with is theft.