Instagram's Vanish Mode is triggered by an easy-to-miss swipe-and-hold gesture in DMs, meaning simply scrolling through old chats can accidentally activate it and notify the other person, creating unnecessary social friction over a completely unintentional action. It's a case of prioritizing gesture convenience over consequence: powerful, fluid interactions are great until they trigger high-stakes, hard-to-undo effects involving another person. Instagram already gates other destructive actions with confirmations, so the fix is simple, add friction where accidental activation risks embarrassment or confusion, not just where it risks data loss.