There's a difference between "this is allowed under their ToS" and "it is academically unethical to fail to credit the people whose specific conversations were fed into a model that was used to solve a problem".
I don't think these people would be so miffed if they had been properly credited - that's how academia works (at least, that's my understanding of it).
I don't think these people would be so miffed if they had been properly credited - that's how academia works (at least, that's my understanding of it).