Researchers built an AI that doxes any anonymous reddit account in under a minutes for $2. eth zurich and anthropic published a terrifying paper proving that ‘practical anonymity’ on the internet is officially dead. They built a fully autonomous ai pipeline that takes your pseudonymous posts, extracts your identity signals, searches the web, and figures out exactly who you are. no human investigator needed. The numbers are actually mind blowing.. - 67% of hacker news users identified correctly - when the system makes a guess, it is right 90% of the time - it even unmasked scientists whose interview transcripts were explicitly redacted for privacy The scariest part? Even time doesn't protect you… They tested users who took a full year break and changed their interests. The Ai still matched their old and new profiles with 90% precision, it sees through your persona changes like they aren't even there. There is no defense against this. The agent splits the work into tiny, benign tasks like summarizing a profile or ranking candidates. No API safety guardrail is going to flag it because no single step looks malicious. Title: Large-scale online deanonymization with LLMs Authors: Simon Lermen (MATS), Daniel Paleka, Joshua Swanson, Michael Aerni (ETH Zurich), Nicholas Carlini (Anthropic), Florian Tramèr (ETH Zurich) arXiv: 2602.16800 (submitted Feb 2026, revised later) arxiv.org/pdf/2602.16800