E2EE protects content in transit and from intermediary infrastructure when key distribution, endpoints and implementation are correct. On its own it says nothing about who controls a device or which metadata is produced.
A serious assessment considers the protocol, identity verification, group changes, backups, new devices, revocation and update process together. A lock icon is not evidence.
Three verification questions
- 01Who can create or replace keys?
- 02How are membership changes handled cryptographically?
- 03Which metadata remains visible?