It seems out of step and foolish, and the cynic in me says that Anthropic has a side hustle of identity harvesting and is looking for justifications, but on the flip side, there is a real risk of pearl clutching if a child ever uses AI, and maybe Anthropic just wants to steer clear of all of that. Though simply putting it in the ToS should be sufficient legal shielding, and the idea that they're chat harvesting to age fingerprint conversations seems dubious.