You probably also thought Anthropic did not use pirated PDFs. You don't know how these companies actually operate & you don't know what weasel language they use in their contracts to get away w/ exactly what I assume to be the case.

There is no AI, all these companies have is the chat logs so unless you have further evidence on what they do or don't do behind the scenes I recommend you use a more conservative approach in your assumptions about what they use or don't use for training.