Imagine you're texting a friend one private thing, just for them, and you hit send. What you never knew is that the "send to a friend" button actually pinned your note to a public bulletin board that the whole internet can walk past and read. That's what happened here. People clicked "share" on their private Claude conversations to show one person, and instead those chats got quietly posted to the open web, where anyone could pull them up with a plain Google search.
Here's why that's a big deal: people pour real things into these chats, health worries, money trouble, stuff they'd never say out loud, trusting it's just them and the machine. The button did exactly what it was built to do, and that was the whole problem, because nobody warned you that "share with one person" secretly meant "share with the world." When a tool hides the one thing you'd care about most, the machine isn't broken. It was built to leave you in the dark.