Ephemeral chat. Nothing is ever written to disk; messages relay live and are never stored. You trust whoever runs this server — and the whole server is one short, readable file.
Sealed to exactly two people — a third is refused. Closing the tab ends it.
Security through obscurity only. Anyone with the link can join, pick a nick, and read everything said while they're present (no backlog). You're the op and can delete it.