> They’re calling it "opt-in," but it doesn't look like that's actually true? You can’t know whether someone you’re talking to -- who may not understand the implications -- has enabled it. In group chats, it looks like a single person turning it on eliminates signal protocol for everyone in the chat.
People already can export backups of the messages they receive, in plain text, and publish those on the Internet if they way.
Signal's threat model has never included "you are directly messaging an adversarial party and expect to retain control over redistribution of those messages".
