Yes, apparently they’re suddenly worried that stealing other people’s work—which is their business model—might backfire on them. I assume this is a measure intended to give the impression—in the face of one of the countless lawsuits against Anthropic—that they’re actually taking licensing or intellectual property rights seriously. I can’t think of any other explanation, because Anthropic simply can’t afford to have questions raised about where the training data used by their models actually comes from.