Matrix Metadata Problem: the server sees everything except your messages

Matrix Metadata Problem: the server sees everything except your messages People pick Matrix because of end-to-end encryption. But E2EE only protects message content — everything around it is plaintext. The server sees: - Your ID, IP, client type and version, device you use - Your presence, typing status, read receipts - Which rooms you join and when you join/leave - Who else is in those rooms → your entire social graph - Room names, topics, avatars (all plaintext state) - For every message: who sent it, which room, a millisecond timestamp, type, size And federation copies all of that to every other server whose users are in the room. Your “social footprint” isn’t one copy — it’s as many as there are servers.