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The goal is to protect you against attackers who try to steal your personal data through prompt injection. But it does limit your ability to access the web.
AIs can be vulnerable to different security threats. And one of the biggest is prompt injection. By feeding malicious commands into your prompts, an attacker could infiltrate your chats, access external files and services, and steal your personal data. An optional setting in ChatGPT called Lockdown mode tries to protect your account by limiting what you can do and where.