Maybe, but it's not like their AI is likely to repeat it back verbatim so it's unlikely to be a copyright violation. It seems like at most, they would be breaking Anthropic's terms of service?
Or maybe they're going through an intermediary "transfer station" that's breaking terms of service:
https://www.chinatalk.media/p/how-to-buy-cheap-claude-tokens...
Yes, it's just a ToS violation at present. Those are legally binding though, despite the common adage. What that really translates to here though, anyone's guess.
Anthropic's own copyright infringement could apparently be forgiven for 1.5B USD after all, so maybe there's a price that breaking the distillation clause for is acceptable too. Or some other arrangement.